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Out of stock
Aero Precision M4E1 Threaded 11.5" 5.56 Barrel Complete Upper Receiver w/ 9" M-LOK ATLAS S-ONE Handguard
Aero Precision
MSRP: $505.00$432.95Aero Precision M4E1 Threaded 11.5" 5.56 Barrel Complete Upper Receiver w/ 9" M-LOK ATLAS S-ONE Handguard This complete upper includes our new ATLAS S-ONE Handguard! The S-ONE line of handguards are...MSRP: $505.00$432.95 -
Out of stock
Dirty Bird 16" Tactical Government .308 Win Stainless Midlength M-LOK Complete Upper
Dirty Bird Industries
MSRP: $709.95$639.95Dirty Bird 16″ Tactical Government .308 Win Stainless Midlength M-LOK Complete Upper The.308 Winchester (7.62x51 NATO) is simply the most popular short-action-big-game-hunting cartridge in the...MSRP: $709.95$639.95 -
Out of stock
Aero Precision EPC-9 Enhanced 8.3" 9mm Complete Upper Receiver w/ Enhanced 7.3" Handguard - Anodized Black
Aero Precision
MSRP: $505.00$432.95Aero Precision EPC-9 Enhanced 8.3" 9mm Complete Upper Receiver w/ Enhanced 7.3" Handguard - Anodized Black This EPC-9 Complete Upper Receiver comes standard with our Enhanced Gen 2 Handguard...MSRP: $505.00$432.95 -
Foxtrot Mike 16" Rear Charging .45 AR-15 Complete Upper, 15" Handguard, CA Compliant Brake, Includes BCG
Foxtrot Mike
MSRP: $499.99$479.95Foxtrot Mike 16" Rear Charging .45 AR-15 Complete Upper, 15" Handguard, CA Compliant Brake, Includes BCG The Foxtrot Mike Products Complete .45 AR upper is the package you have been waiting for to...MSRP: $499.99$479.95 -
Out of stock
Aero Precision M4E1 Threaded Complete Upper 10" .300 Blackout Barrel ATLAS R-ONE 9" M-LOK HG - Anodized
Aero Precision
MSRP: $615.00$529.95Aero Precision M4E1 Threaded Complete Upper 10" .300 Blackout Barrel ATLAS R-ONE 9" M-LOK HG - Anodized Explore the capabilities of the Aero Precision M4E1 Threaded...MSRP: $615.00$529.95 -
Out of stock
Lone Wolf Arms Compact Timberwolf / FreedomWolf Frame Completion Kit
Lone Wolf Distributors
MSRP: $69.95$62.95Lone Wolf Arms Compact Timberwolf / FreedomWolf Frame Completion Kit Everything you need to complete your compact Timberwolf or Glock OEM frame including LWD's Universal Trigger Housing...MSRP: $69.95$62.95 -
Out of stock
Aero Precision M4E1 8" .300 BLK Threaded Complete Upper w/ ATLAS R-ONE 7" M-LOK Handguard - Black
Aero Precision
MSRP: $595.00$521.95Aero Precision M4E1 8" .300 BLK Threaded Complete Upper w/ ATLAS R-ONE 7" M-LOK Handguard - Black This complete upper includes our new ATLAS R-ONE Handguard! The R-ONE handguards are designed with...MSRP: $595.00$521.95 -
Out of stock
Aero Precision M4E1 Complete Upper, 8" 5.56 Pistol Barrel w/ 7.3" Enhanced Gen 2 Handguard - FDE Cerakote
Aero Precision
MSRP: $605.00$529.95Aero Precision M4E1 Complete Upper, 8" 5.56 Pistol Barrel w/ 7.3" Enhanced Gen 2 Handguard - FDE Cerakote This Complete Upper includes our Gen 2 Enhanced Handguard! Key features include the addition...MSRP: $605.00$529.95 -
Reptilia Corp ROF-90 For Geissele 34mm Super Precision Mount & Trijicon RMR
Reptilia Corp
MSRP: $114.95$103.95Reptilia Corp ROF-90 For Geissele 34mm Super Precision Mount & Trijicon RMR The 34mm ROF-90 is a drop-in upgrade for Geissele® Automatics’ Super Precision 34mm optic mount. The ROF-90...MSRP: $114.95$103.95 -
Out of stock
Aero Precision M4E1-T 18" .223 Wylde Rifle Complete Upper w/ 15" M-LOK ATLAS S-ONE Handguard
Aero Precision
MSRP: $700.00$607.95Aero Precision M4E1-T 18" .223 Wylde Rifle Complete Upper w/ 15" M-LOK ATLAS S-ONE Handguard This complete upper includes our ATLAS S-ONE Handguard! The S-ONE line of handguards are designed with...MSRP: $700.00$607.95 -
Out of stock
Aero Precision M4E1 Complete Upper 14.5" 5.56 Mid-Length Barrel EM-12 Gen 2 Handguard - Anodized Black
Aero Precision
MSRP: $640.00$546.95Aero Precision 14.5" 5.56 M4E1 Complete Upper Built to provide unmatched durability and performance, this complete upper receiver features a mid-length 14.5” 5.56 barrel and a 12” Gen 2...MSRP: $640.00$546.95 -
Out of stock
Dirty Bird 16" 5.56 NATO Govt M-LOK AR-15 Complete Upper Assembly V3
Dirty Bird Industries
MSRP: $469.95$439.95Dirty Bird 16" 5.56 NATO Govt M-LOK Upper Assembly V3 This Dirty Bird Industries Complete Upper features a Black Nitride 16" Sub-MOA Government Profile barrel chambered in 5.56 with a 1:7 twist...MSRP: $469.95$439.95 -
7.5" Slick Side Billet 5.56 Nitride Pistol M-LOK AR-15 Complete Upper Assembly
Black Rifle Depot
MSRP: $279.95$259.957.5" Slick Side Billet 5.56 Nitride Pistol M-LOK Upper Assembly Premium Performance at a Budget-Friendly Price This 7.5" pistol upper assembly offers affordability without cutting corners. Featuring...MSRP: $279.95$259.95 -
Out of stock
Aero Precision M4E1 Threaded 20" .350 Legend Carbine Length Complete Upper w/ 16.6" ATLAS R-ONE Handguard - FDE Cerakote
Aero Precision
MSRP: $790.00$674.95Aero Precision M4E1 Threaded 20" .350 Legend Carbine Length Complete Upper w/ 16.6" ATLAS R-ONE Handguard - FDE Cerakote The Aero Precision M4E1-T 20in Complete Upper was developed to be the ideal...MSRP: $790.00$674.95 -
Out of stock
Aero Precision M4E1 Threaded Complete Upper 7.5" 5.56 Barrel ATLAS R-ONE 7" M-LOK HG - Anodized
Aero Precision
MSRP: $424.99$419.95Aero Precision M4E1 Threaded Complete Upper 7.5" 5.56 Barrel ATLAS R-ONE 7" M-LOK HG - Anodized This complete upper includes our new ATLAS R-ONE Handguard! The R-ONE handguards are designed with size...MSRP: $424.99$419.95 -
Out of stock
Aero Precision M4E1 Complete Upper 16" .300 Blackout Barrel EM-15 Gen 2 Handguard - Anodized Black
Aero Precision
MSRP: $660.00$565.95Aero Precision M4E1 Complete Upper 16" .300 Blackout Barrel EM-15 Gen 2 Handguard - Anodized Black This Complete Upper includes Aero Precision's Gen 2 Enhanced Handguard! Key features include the...MSRP: $660.00$565.95 -
Out of stock
Aero Precision M4E1 Threaded No FA Complete Upper 16" 5.56 Mid 15" M-LOK ATLAS R-ONE - Anodized Black
Aero Precision
MSRP: $645.00$550.95Aero Precision M4E1 Threaded No FA Complete Upper 16" 5.56 Mid 15" M-LOK ATLAS R-ONE - Anodized Black Lightweight and Customizable Upper with ATLAS R-ONE Handguard and No Forward Assist The Aero...MSRP: $645.00$550.95 -
Out of stock
Aero Precision M4E1-T Complete Upper, 16" .223 Wylde SS Barrel, 15" M-LOK ATLAS S-ONE HG - Anodized
Aero Precision
MSRP: $575.00$494.95Aero Precision M4E1-T Complete Upper, 16" .223 Wylde SS Barrel, 15" M-LOK ATLAS S-ONE HG - Anodized This complete upper includes our new ATLAS S-ONE Handguard! The S-ONE line of handguards are...MSRP: $575.00$494.95 -
Dirty Bird 18" Fluted 6.5 Creedmoor Midlength Stainless Steel Slick-Side M-LOK Complete Upper
Dirty Bird Industries
MSRP: $799.95$749.95Dirty Bird 18" Fluted 6.5 Creedmoor Midlength Stainless Steel Slick-Side M-LOK Complete Upper The Dirty Bird 18" 6.5 Creedmoor Complete Upper is THE start to your next precision...MSRP: $799.95$749.95 -
Out of stock
Aero Precision M4E1 Threaded Complete Upper, 16" 5.56 Mid-Length Barrel w/ 15" ATLAS R-ONE M-LOK Handguard - FDE
Aero Precision
MSRP: $695.00$599.95Aero Precision M4E1 Threaded Complete Upper, 16" 5.56 Mid-Length Barrel w/ 15" ATLAS R-ONE M-LOK Handguard - FDE This complete upper includes Aero's new ATLAS R-ONE Handguard! The R-ONE handguards...MSRP: $695.00$599.95 -
Out of stock
Aero PrecisionEPC-9 Threaded 8.3" 9mm Complete Upper Receiver w/ ATLAS S-ONE 7.3" Handguard - FDE Cerakote
Aero Precision
MSRP: $550.00$470.95Aero PrecisionEPC-9 Threaded 8.3" 9mm Complete Upper Receiver w/ ATLAS S-ONE 7.3" Handguard - FDE Cerakote Introducing the Aero Precision EPC-9 Threaded 8.3" 9mm Complete Upper Receiver with ATLAS...MSRP: $550.00$470.95 -
Out of stock
16" Slick Side Billet 5.56 416R Stainless Midlength 1:8 M-LOK Complete Upper
Black Rifle Depot
MSRP: $369.95$329.9516" Slick Side Billet 5.56 416R Stainless Midlength 1:8 M-LOK Complete Upper An affordable AR15 upper assembly that doesn't skimp on quality: this model features a nitrided steel gas block from a...MSRP: $369.95$329.95 -
Out of stock
Aero Precision EPC-9 Threaded 5.5" 9mm Complete Upper Receiver w/ ATLAS R-ONE 4.8" Handguard - FDE Cerakote
Aero Precision
MSRP: $530.00$451.95Aero Precision EPC-9 Threaded 5.5" 9mm Complete Upper Receiver w/ ATLAS R-ONE 4.8" Handguard - FDE Cerakote This EPC-9 Complete Upper Receiver comes standard with our ATLAS R-ONE Handguard. The...MSRP: $530.00$451.95 -
Out of stock
Aero Precision M4E1-T Complete Upper, 8" .300 Blackout Barrel, 7" M-LOK ATLAS S-ONE HG, Anodized Black
Aero Precision
MSRP: $595.00$516.95Aero Precision M4E1-T Complete Upper, 8" .300 Blackout Barrel, 7" M-LOK ATLAS S-ONE HG, Anodized Black This complete upper includes our new ATLAS S-ONE Handguard! The S-ONE line of handguards are...MSRP: $595.00$516.95 -
Out of stock
M4E1 Enhanced Complete Upper 14.5" 5.56 Mid-Length Barrel w/ Pinned Epsilon 556SL 12" M-LOK HG - Black
Aero Precision
MSRP: $725.00$624.95Aero Precision M4E1 Enhanced Complete Upper 14.5" 5.56 Mid-Length Barrel w/ Pinned Epsilon 556SL 12" M-LOK HG - Black This Complete Upper includes Aero's Gen 2 Enhanced Handguard! Key features...MSRP: $725.00$624.95 -
Out of stock
Aero Precision M4E1 Threaded Complete Upper, 16" 5.56 Mid Pencil Length Barrel, 15" M-LOK ATLAS S-ONE Handguard - Anodized Black
Aero Precision
MSRP: $660.00$565.95Aero Precision M4E1 Threaded Complete Upper, 16" 5.56 Mid Pencil Length Barrel, 15" M-LOK ATLAS S-ONE Handguard - Anodized Black Protect your hands and rails from your muzzle with this Aero...MSRP: $660.00$565.95 -
Out of stock
Aero Precision M4E1 Threaded Complete Upper, 16" 5.56 Mid-Length Barrel, ATLAS R-ONE 15" M-LOK HG
Aero Precision
MSRP: $655.00$569.95Aero Precision M4E1 Threaded Complete Upper, 16" 5.56 Mid-Length Barrel, ATLAS R-ONE 15" M-LOK HG This Aero Precision M4E1 Threaded AR-15 upper receiver group comes completely assembled with...MSRP: $655.00$569.95 -
Out of stock
Aero Precision M4E1 Threaded PRO 13.7" CHF 5.56 M-LOK Midlength AR-15 Complete Upper
Aero Precision
MSRP: $1,115.00$969.95Aero Precision M4E1 Threaded PRO 13.7" CHF 5.56 M-LOK Midlength Complete Upper The PRO Upper Receiver Group built around our PRO 5.56 Cold Hammer Forged Barrel that is paired with our PRO 5.56 BCG...MSRP: $1,115.00$969.95 -
Lone Wolf Arms Timberwolf Frame Completion Kit for TWL w/o Trigger Bar
Lone Wolf Distributors
MSRP: $69.95$62.95Lone Wolf Arms Timberwolf Frame Completion Kit for TWL w/o Trigger Bar Not only has Lone Wolf Distributors created a kit that is truly UNIVERSAL, but it includes the industry's first truly...MSRP: $69.95$62.95 -
Out of stock
Aero Precision M4E1 Threaded Complete Upper, 7.5" 5.56 Barrel, 7" M-LOK ATLAS S-ONE Handguard - Anodized Black
Aero Precision
MSRP: $424.99$344.95Aero Precision M4E1 Threaded Complete Upper, 7.5" 5.56 Barrel, 7" M-LOK ATLAS S-ONE Handguard - Anodized Black This complete upper includes our new ATLAS S-ONE Handguard! The S-ONE line of handguards...MSRP: $424.99$344.95 -
Out of stock
Aero Precision M5 24" 6.5 Creedmoor SS Fluted Complete Upper Receiver with 15" ATLAS S-ONE Handguard - Anodized Black
Aero Precision
MSRP: $935.00$797.95Aero Precision M5 24" 6.5 Creedmoor SS Fluted Complete Upper Receiver with 15" ATLAS S-ONE Handguard - Anodized Black This complete upper includes Aero Precision's ATLAS S-ONE Handguard! The S-ONE...MSRP: $935.00$797.95 -
Out of stock
Aero Precision AR15 Complete Upper w/ No Forward Assist, 8" .300 Blackout Barrel, 7" M-LOK ATLAS S-ONE Handguard - Anodized Black
Aero Precision
MSRP: $434.99$426.95Aero Precision AR15 Complete Upper w/ No Forward Assist, 8" .300 Blackout Barrel, 7" M-LOK ATLAS S-ONE Handguard - Anodized Black This AR15 Complete Upper Receiver, paired with the ATLAS S-ONE...MSRP: $434.99$426.95 -
Out of stock
Aero Precision M4E1 Threaded Complete Upper, 10.5" 5.56 Barrel, 9" M-LOK ATLAS S-ONE Handguard - FDE Cerakote
Aero Precision
MSRP: $635.00$541.95Aero Precision M4E1 Threaded Complete Upper, 10.5" 5.56 Barrel, 9" M-LOK ATLAS S-ONE Handguard - FDE Cerakote With this complete upper receiver, you can finish your new build with confidence that...MSRP: $635.00$541.95 -
Out of stock
Ballistic Advantage AR-15 Complete Upper, 16" 5.56 Hanson Midlength Barrel w/15" Logic M-LOK Handguard
Ballistic Advantage
$539.00Ballistic Advantage AR-15 Complete Upper, 16" 5.56 Hanson Midlength Barrel w/15" Logic M-LOK Handguard Ballistic Advantage is known for making high-quality AR parts. Their 16" 5.56 Hanson Mid-Length...$539.00 -
Out of stock
Foxtrot Mike 9" .223 Wylde Lightweight Pistol M-LOK Complete Upper
Foxtrot Mike
$499.00The Foxtrot Mike Products FM-15 Gen 2 Side Charging AR-15 Upper Receiver features a unique dual spring recoil system nested in the top of the upper receiver allowing the use of a folding stock. This...$499.00 -
Out of stock
Aero Precision EPC-9 Threaded 8.3" 9mm Complete Upper Receiver w/ ATLAS R-ONE 7.3" Handguard - FDE Cerakote
Aero Precision
MSRP: $550.00$470.95Aero Precision EPC-9 Threaded 8.3" 9mm Complete Upper Receiver w/ ATLAS R-ONE 7.3" Handguard - FDE Cerakote This EPC-9 Complete Upper Receiver comes standard with our ATLAS R-ONE Handguard. The...MSRP: $550.00$470.95 -
Lone Wolf Arms Frame Completion Kit for Gen 4 Full Size Glock
Lone Wolf Distributors
MSRP: $74.95$67.95Lone Wolf Arms Frame Completion Kit for Gen 4 Full Size Glock Everything you need to complete your Gen4 Fullsize Glock OEM frame including LWD's NEW Universal Trigger Housing...MSRP: $74.95$67.95 -
Out of stock
Aero Precision EPC-9 Threaded 16" 9mm Complete Upper Receiver w/ ATLAS R-ONE 15" Handguard - Anodized Black
Aero Precision
MSRP: $590.00$503.95Aero Precision EPC-9 Threaded 16" 9mm Complete Upper Receiver w/ ATLAS R-ONE 15" Handguard - Anodized Black Streamlined Precision and Lightweight Customization The Aero Precision EPC-9 Complete Upper...MSRP: $590.00$503.95 -
Out of stock
Aero Precision 5.56 Bolt Carrier Group, Complete - Nickel Boron
Aero Precision
MSRP: $210.00$184.95Aero Precision 5.56 Bolt Carrier Group, Complete - Nickel Boron The upgraded nickel boron carrier group is an eye catching addition to your AR build. Mil-spec dimensions and coating ensure the...MSRP: $210.00$184.95 -
Out of stock
Aero Precision M5 Complete Upper 22" 6.5 Creedmoor SS Rifle Barrel ATLAS S-ONE 15" M-LOK HG - FDE Cerakote
Aero Precision
MSRP: $905.00$774.95Aero Precision M5 Complete Upper 22" 6.5 Creedmoor SS Rifle Barrel ATLAS S-ONE 15" M-LOK HG - FDE Cerakote This 6.5 Creedmoor upper is an easy upgrade to your existing or new build M5/308 AR...MSRP: $905.00$774.95
Featured
Rise Armament RA-140 Drop-in Trigger
Rise Armament
MSRP:
$149.99
$129.95
Rise Armament RA-140 Drop-in Trigger
Upgrade Your AR-15 for Precision and Speed with a Single-Stage, 3.5lb. Trigger Pull
The Rise Armament RA-140 Super Sporting Trigger (SST) is designed for shooters...
Mil Spec AR 15 Stock and Buffer Kit
Black Rifle Depot
MSRP:
$54.95
$49.95
Mil Spec AR 15 Stock and Buffer Kit
This Mil Spec AR 15 Stock and Buffer Kit has the standard M4 adjustable six position stock design with sling attachment. It comes complete with everything needed...
AR 15 Lower Build Kit
Black Rifle Depot
MSRP:
$109.95
$74.95
AR 15 Lower Build Kit
The AR 15 Lower Build Kit from Black Rifle Depot stands as the pinnacle of excellence for those keen on crafting or upgrading their AR 15 or related lower receiver...
AO Precision C158 SP/HPT/MPI 5.56 Black Nitride Bolt Carrier Group
AO Precision
MSRP:
$169.95
$119.95
AO Precision C158 SP/HPT/MPI 5.56 Black Nitride Bolt Carrier Group
AO Precision has provided BCGs to large military contractors such as FN America and large commercial retailers who...
Upper Parts Kit for Glock 19
Black Rifle Depot
MSRP:
$59.95
$44.95
Upper Parts Kit for Glock 19
These Black Rifle Depot Upper Parts Kits for your Glock 19 are complete with all the parts replacement parts required to finish or upgrade your pistol slide. These Glock...
Upper Parts Kit for Glock 17
Black Rifle Depot
MSRP:
$59.95
$44.95
Upper Parts Kit for Glock 17
These Black Rifle Depot Upper Parts Kits for your Glock 17 are complete with all the parts replacement parts required to finish or upgrade your
Lower Parts Kit for Glock 17
Black Rifle Depot
MSRP:
$65.95
$39.95
Lower Parts Kit for Glock 17
The Black Rifle Depot Lower Parts Kit for Glock 17 has all the lower parts necessary to complete your compact pistol frame build. This complete kit is...
AR 15 Forward Assist
Black Rifle Depot
MSRP:
$11.95
$9.95
AR 15 OEM Forward Assist
This OEM Black Rifle Depot true Mil-spec AR-15 / AR-308 Forward Assist Assembly Kit features a tool steel forward assist pawl and press fit and pinned cap. It is a
Lower Parts Kit for Glock 19
Black Rifle Depot
MSRP:
$59.95
$39.95
Lower Parts Kit for Glock 19
The Black Rifle Depot Lower Parts Kit for Glock 19 has all the lower parts necessary to complete your compact pistol frame build.
Armaspec SFT45/90 Ambi Safety Selector
Armaspec
$42.75 - $44.99
Armaspec SFT45/90 Ambi Safety Selector
Switchable 45° or 90° Ambidextrous Safety for AR Platforms
The Armaspec SFT45/90 Ambi Safety Selector offers unmatched versatility with the ability to set your...
Strike Industries Billet Magazine Catch
Strike Industries
MSRP:
$18.95 - $20.95
$15.50 - $17.15
Strike Industries Strike Billet Magazine Catch
The Strike Billet Magazine Catch Assembly features a billet magazine release button. Sculpted from a solid piece of 6061 aluminum, the button...
Rise Armament RAVE-140 Super Sporting Flat Drop In Trigger
Rise Armament
MSRP:
$149.99
$139.99
Rise Armament RAVE 140 Super Sporting Flat Drop In Trigger With Anti Walk Pins
The Rise Armament RAVE 140 Super Sporting Flat Drop-In Trigger With Anti Walk Pins is an ideal choice for upgrading...
Surplus Complete Lower Parts Kit
Black Rifle Depot
MSRP:
$59.00
$39.95
Surplus Complete Lower Parts Kit
The Surplus complete lower parts kit is a mil-spec or better LPK with well-machined components.
Specifications
31 piece set to complete a lower
Machined parts, no...
Out of stock
Anderson Manufacturing Stripped AR 15 Upper Receiver
Anderson Manufacturing
MSRP:
$69.95
$49.95
Anderson Manufacturing Stripped AR 15 Upper Receiver
The Anderson Manufacturing Stripped AR 15 Upper Receiver is a top-of-the-line compone
Stainless Steel Gas Tubes
Black Rifle Depot
MSRP:
$14.95
$11.95
Stainless Steel Gas Tubes
Beautifully smooth, precisely curved, and exacting length, these gas tubes are the perfect addition to your new build.
Features:
Stainless Steel Construction
Beveled...
AR 15 Charging Handle
Black Rifle Depot
MSRP:
$19.95
$17.95
AR 15 Charging Handle
Upgrade your AR-15 rifle system with the AR-15 Charging Handle from Black Rifle Depot. This standard charging handle is made in the USA from high-quality 7075-T6 aluminum,...
Strike Industries AR 15 Ultimate Dust Cover
Strike Industries
MSRP:
$15.95
$13.95
Strike Industries AR 15 Ultimate Dust Cover - .223/5.56
The patent pending SI UDC enables users to attach and detach the cover in 5 to 10 seconds with ease (stock dust cover will take...
AR 15 Carbine Buffer Tube Kit
Black Rifle Depot
MSRP:
$39.95
$24.95
AR 15 Carbine Buffer Tube Kit
The AR 15 Carbine Buffer Tube Kit is an impeccable solution for completing your lower receiver with both efficiency and economy in mind! Crafted with lightweight and...
Strike Industries Forward Assist Kit (Black, Blue, FDE, Red)
Strike Industries
MSRP:
$21.95 - $22.95
$18.95 - $19.95
Strike Industries Forward Assist Kit - (Black, Blue, FDE, Red)
The New Strike forward assist is the latest addition to the Strike Industries line of performance AR parts. The
.750 Low Profile Gas Block - Black Nitride
Black Rifle Depot
MSRP:
$22.95
$18.95
.750 Low Profile Gas Block - Black Nitride
The Black Rifle Depot AR 15 Low Profile Gas Block is a top-quality component for your AR 15 build. Made from 4140 hardened steel, this gas block is...