AR-15 Parts
Magazines • Stocks • Handguards • BCGs • Triggers • Muzzle Devices
The full AR-15 platform parts catalog at Keep Shooting — roughly two hundred SKUs spanning every component class on the modern sporting rifle. Polymer magazines from Magpul, MFT, Hexmag, Hera Arms, Amend2, and ETS, metal-body magazines from Duramag and ASC, plus specialty drums and high-capacity sticks from KCI and Schmeisser. Stocks and buffer systems from Magpul, FAB Defense, Hogue, Aim Sports, LWRC, and LBE Unlimited. Handguards, BCGs, lower parts kits, muzzle devices, and small parts from CMMG, Aim Sports, UTG Pro, Battle Arms Development, and Wheeler Engineering. Plus the caliber-variant SKUs for shooters running 9mm-AR PCCs (Angstadt Arms BCG and buffer), 6.8 SPC, 300 Blackout, and the .308 / 7.62 NATO AR-10 platform. Building a rifle from a stripped lower, upgrading a factory build, or keeping spare mags topped off — the catalog covers it.
AR-15 Parts at Keep Shooting
The AR-15 is the most-customized rifle platform in American shooting because almost every part on it is designed to be swapped. The buffer tube comes off with a wrench, the handguard with a barrel-nut tool, the trigger group with a pair of punches, and the magazine with the press of a button. That makes the AR-15 parts catalog at Keep Shooting deliberately broad — roughly two hundred SKUs covering magazines (polymer, metal-body, and specialty), stocks and buffer systems, handguards and rails, bolt carrier groups and lower parts kits, muzzle devices and controls, plus the caliber-variant SKUs for shooters running 9mm-AR PCCs, 6.8 SPC, 300 Blackout, or the larger .308 AR-10 platform. The catalog is organized below by component class rather than brand or price so a builder can walk top-down through what a complete AR-15 needs.
AR-15 Magazines — The PMAG Standard and a Full Alternatives Tier
Magazines are the most-stocked sub-bucket in the catalog because they're consumable — shooters buy mags in fives and tens, wear them out, replace them, lose them at the range. The Magpul PMAG line is the industry default and the magazine that defined the modern AR-15 category. The PMAG Gen M3 30-Round Black is the most-issued AR magazine in the American civilian market, with the Coyote Tan and translucent TMAG M3 rounding out the variant set. The PMAG Gen 3 20-Round is the standard short-mag for benchrest and prone-shooting use. For the .308 AR-10 platform Magpul makes the PMAG LR/SR Gen M3 20-Round, a 25-Round windowed variant, a 10-Round LR/SR for state capacity restrictions, and the PMAG D-50 50-Round drum for high-capacity range use.
Polymer alternatives to the PMAG in our catalog cover the full engineering-variant set. Amend2 is the Idaho-made budget polymer alternative — the most popular PMAG substitute by volume. Mission First Tactical Extreme Duty mags ship in the operational windowed black variant and the Gadsden-flag themed variant — the cutout-window approach to round-count visibility. Hexmag runs the hexagonal-grip body with the HexID color-coding system and the carbon-fiber Series 2 variants for weight-conscious builds. Hera Arms H3T Gen-2 takes the transparent-spine approach — one narrow strip of translucent polymer running the body length for continuous round-count visibility, the middle path between windowed and fully translucent. ETS runs the fully translucent approach — the 30-round and the unusual ETS with Coupler (two-mag jungle-style coupled pair) are both in inventory. UTG rounds out the polymer tier with the windowed 30-round at the budget end of the cutout-window category.
Metal-body magazines for the shooters who deliberately want to leave the polymer tier behind. Duramag is the civilian-aftermarket brand of C Products Defense (CPD), the Brooksville Florida manufacturer holding active DOD contracts for M16/M4 service magazines — their AR-15 30-round runs a 6061-T6 anodized aluminum body, marketed under the brand's "Some Things Should Never Be Plastic" position. ASC (Ammunition Storage Components) is the Connecticut-area parallel — the ASC 30-round stainless steel with orange follower runs a true stainless body (rather than anodized aluminum) with a high-visibility polymer follower for empty-mag awareness during reloads.
Specialty & high-capacity round out the magazine tier. The Schmeisser S60 sixty-round M4 magazine is the high-capacity stick option for shooters who want PMAG-D-50 capacity without drum bulk. KCI USA ships both a 21-round compact and a drum magazine for the budget high-capacity slot, and the T91 magazine (Taiwanese USGI-spec witness-hole variant) rounds out the military-pattern collector tier. Color-coded training mags — the red and blue polymer mags — sit at the bottom of the catalog for shooters segregating practice rounds, dummy rounds, or instructor-marked mags from live carry.
Stocks, Pistol Grips & Buffer Systems — The Lower Receiver Build
The stock and pistol grip define how the rifle fits the shooter. The Magpul MOE Fixed M4 Carbine Stock is the canonical no-collapse mil-spec carbine-buffer-tube stock — the upgrade most new AR-15 owners make first. The FAB Defense GL-Core S Buttstock is the Israeli-engineered collapsing stock with adjustable cheek-weld geometry from FAB Defense. The Hogue AR-15 stock and stock with pistol grip complete-set pair the OverMolded rubber grip texture Hogue is known for with their AR product line. The Aim Sports line includes the Advanced Modular Stock and the G.I. Style fixed stock for period-correct or fixed-length-of-pull builds. The LWRC Compact Stock is the premium tactical option from LWRC International. For complete stock-and-buffer-tube installations on a new build, the LBE Unlimited Complete Mil-Spec M4 6-Position Stock Kit bundles the buffer tube, buffer, spring, castle nut, and end plate with the collapsing stock body — one purchase replaces what would otherwise be five separate part orders. Pistol grips include the AR-15 A2 Pistol Grip (the original USGI grip geometry) and the Adjustable Tactical Grip.
Handguards, Rails & Sight Systems — The Upper Receiver Build
The handguard is the second-largest single component on the rifle and the one that defines the modern look. The Aim Sports M4 Carbine Length Quad Rail is the budget four-sided Picatinny free-float handguard for shooters running a full slick-side rail surface for accessories. The UTG Pro AR-15 Carbine Length Drop-In Quad Rail Handguard is the no-tools-required upgrade that replaces the factory plastic round handguard without removing the delta ring or barrel nut — a meaningful workflow advantage for shooters who don't have a barrel nut wrench on the bench. For iron sights, the Aim Sports AR-15 Detachable Carry Handle replicates the M16A2 fixed-carry-handle rear sight on a removable Picatinny mount, and the AR-15 Adjustable Rear Sight is the flip-up backup-iron-sight (BUIS) for optics-primary builds.
Bolt Carrier Groups, Lower Parts Kits & Internals
For builders working from a stripped lower receiver, the CMMG lower parts kits cover the small-parts complement: the AR-15 Gun Builders LPK is the standard 5.56 / .223 kit (springs, detents, pins, trigger group, hammer, safety selector — everything except the stock, grip, and trigger guard), and the 308 Premium Lower Parts Kit is the equivalent for the AR-10 / .308 platform. The CMMG AR-15 Survival Kit is the field-spare bundle — the most-failed small parts on the platform (firing pin retaining pin, bolt cam pin, gas rings, extractor spring) in a single replacement pack for armorers and serious users to keep in a range bag. For modular trigger and selector upgrades, the Battle Arms Development Enhanced Modular Magazine Release and the AR-15 Ambidextrous Safety Selector are the canonical first upgrades.
For 9mm AR pistol-caliber-carbine builds, the catalog covers the two purpose-built components from Angstadt Arms, the Charlotte NC originator of the GLOCK-mag-fed AR9 platform. The Angstadt 9mm Bolt Carrier Group is the dedicated 9mm BCG — a 5.56 BCG will not function on a 9mm upper because 9mm AR runs straight blowback rather than gas impingement, requiring deliberately added carrier mass and the absence of a gas key. The Angstadt 9mm Carbine Buffer Assembly is the matching heavier buffer needed to control the blowback cycle rate (a standard H1 carbine buffer at ~3.8oz will short-stroke a 9mm AR; 9mm buffers run roughly 5-8oz to slow the cycle).
Muzzle Devices & Small Parts — Barrel Hardware and Controls
The AR-15 A2 Flash Hider is the canonical "birdcage" muzzle device — the prong-and-port pattern adopted on the M16A2 in 1985 and still the most-issued military muzzle device today. Installation pairs with the 1/2-inch crush washer (the carbon-steel default) or the stainless-steel variant for builds where the carbon-steel washer's corrosion is a concern. For barrel replacement and gunsmithing work, the AR-15 Barrel Nut and Barrel Extension are the OEM-spec hardware for fitting a new barrel to a stripped upper.
Caliber Variants — 9mm PCC, 6.8 SPC, 300 Blackout, AR-10 / .308
The AR platform is not just one caliber. The catalog covers the major civilian chamberings beyond 5.56 NATO. For 9mm AR PCC builds, see the Angstadt Arms 9mm BCG and carbine buffer covered above. For 6.8 SPC, the Ruger SR-556 6.8mm SPC 25-Round and 5-Round magazines from Ruger cover the dedicated 6.8 SPC platform. For 300 AAC Blackout, the Ruger SR-556 300 Blackout 30-Round is the dedicated subsonic-and-supersonic magazine. For the .308 / 7.62 NATO AR-10 platform, the Magpul PMAG LR/SR series (covered in the magazine section above), the UTG AR-308 25-Round windowed, the CMMG 308 lower parts kit, the Dutch Army .308 double mag pouch, and the Magpul D-50 drum give .308 / 7.62x51 builders a complete component set.
Tools, Cleaning & Magazine Pouches
For armorer-tier maintenance, the Wheeler Engineering Compact AR Tool is the multi-purpose pocket-sized armorer's wrench (castle-nut, A2-front-sight, and general-purpose pin work in one body), and the 5.56mm AR-15 Cleaning Rod Handle is the T-handle for the standard chamber-cleaning rod. For magazine carry on the belt or chest rig, the Belgian Jigsaw Camo AR-15 mag pouch and Dutch Army .308 double mag pouch bring surplus-grade load-bearing options into the AR-parts catalog at price points well below modern Cordura equivalents.
Pairing & Cross-References
For dedicated AR-15 magazine browsing outside this parts catalog, see the AR-15 magazines category, which contains the same polymer / metal-body / specialty inventory organized purely as magazines. For the broader gun parts catalog covering other platforms, see the AK-platform parts category (the Soviet-pattern equivalent of the AR-15 build catalog) and the M16 parts category (military-issue full-auto-spec components, where the M16 receiver geometry differs from the semi-auto-only civilian AR-15). For ammunition to feed the platform, see the rifle ammunition category covering 5.56 / .223, 6.8 SPC, 300 Blackout, and .308 / 7.62 NATO. For platform-filtered shopping by your specific AR-15 build, see the Shop by Gun tool.
For brand-specific deep-dives organized by component class:
Polymer magazines — Magpul, Amend2, Mission First Tactical, Hexmag, Hera Arms, ETS, UTG.
Metal-body magazines — Duramag (aluminum / stainless, C Products Defense), ASC (stainless steel, Ammunition Storage Components).
High-capacity & specialty — KCI USA (drums and stick mags), Schmeisser (S60 60-round), Ruger (6.8 SPC and 300 Blackout).
Stocks & grips — Magpul (MOE), FAB Defense (GL-Core S), Hogue (OverMolded), Aim Sports (modular + GI), LWRC (compact), LBE Unlimited (complete M4 kit).
BCGs, LPKs, and 9mm AR — CMMG (LPKs, Survival Kit), Angstadt Arms (9mm BCG and buffer), Battle Arms Development (modular controls).
Tools, accessories & rails — Wheeler Engineering (Compact AR Tool), Backup Tactical, Q LLC.
Frequently Asked Questions — AR Parts
Keep Shooting carries a wide selection of AR Parts products from trusted brands. Browse our catalog to see the full range, and use the filters on the left to narrow by brand, price, or product type.
Yes! All orders over $49.95 qualify for free shipping, including AR Parts products. Orders typically ship within 1–2 business days.
Keep Shooting offers hassle-free returns on AR Parts products. If you're not completely satisfied, contact our customer service team for a return authorization. All products must be in original, unused condition.
If you need help choosing the right AR Parts product, our team is available to assist. Check individual product descriptions for detailed specifications, or contact us directly and we'll help you find the best fit for your needs.