Rifle Parts
Whether you're building a new rifle from scratch or looking to upgrade an existing firearm, our vast selection of rifle parts has everything you are going to need in that journey. At Rainier Arms' selection of rifle parts, you can find a wide variety of products including lower and upper parts, trigger parts, muzzle devices, and many more.
Explore our selection of high-quality parts coming from various leading manufacturers like Strike Industries, Magpul, BCM, and many more.
Also, don't forget to check our specially-made Rainier Arms barrels for your firearms.
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Elftmann Tactical Rem 700 Precision Rifle Trigger w/ Safety, Internal Bolt ReleaseSpecial Price $209.92 Regular Price $286.00
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Quarter Circle 10 Side Charging QC5 9MM PCC Builders KitSpecial Price $712.99 Regular Price $949.95
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Quarter Circle 10 Rear Charging (Glock Compatible) Small Frame 9MM PCC Builders KitSpecial Price $668.99 Regular Price $890.95
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Dead Foot Arms MCS RIFLE CALIBER with Left Side Folding Stock AdaptorSpecial Price $399.92 Regular Price $451.00
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Dead Foot Arms BCM - MCS 9MM - With Right Side Folding Stock AdaptorSpecial Price $349.92 Regular Price $455.00
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Sharps Bros Hellbreaker AR-15 Complete Lower Receiver w/o stock - Gen 2Special Price $299.99 Regular Price $399.95
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Rainier Arms Xtreme Tactical Compensator (XTC) 2.0 9MM Muzzle Device - Stainless Steel 1/2x36 TPISpecial Price $49.99 Regular Price $79.95
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Battle Arms Development AR-15 Enhanced Bolt Carrier Group - Full AutoSpecial Price $169.92 Regular Price $189.95
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Rainier Arms Xtreme Tactical Compensator (XTC) 2.0 .308/7.62 Muzzle Device - Black NitrideSpecial Price $49.99 Regular Price $79.95
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Mission First Tactical (MFT) Engage AR15 Pistol Grip - SDESpecial Price $10.92 Regular Price $19.99
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Grey Ghost Precision Cornerstone AR-15 Forged Stripped LowerSpecial Price $89.92 Regular Price $104.88
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Andro Corp Industries AR-15 MOD Complete Lower Receiver - No StockSpecial Price $219.92 Regular Price $271.15
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Andro Corp Industries AR-15 5.56 NATO Partial Upper Receiver Group - 10.3"Special Price $285.92 Regular Price $384.75
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Andro Corp Industries AR-15 Enhanced Bolt Carrier Group (BCG) - NitrideSpecial Price $102.92 Regular Price $144.99
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Spinta Precision AR-15 9MM Barrel - 3.1" (Rainier Arms Exclusive)Special Price $57.20 Regular Price $119.99
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Quarter Circle 10 Blu Whistler (Sig Sauer P320) Rear Charging Receiver SetSpecial Price $344.99 Regular Price $460.00
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Quarter Circle 10 Complete Side Charging AR-15 9mm PCC UpperSpecial Price $701.99 Regular Price $934.95
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Aero Precision AR-15 Stripped Lower Receiver - Special Edition: Tacoma HeritageSpecial Price $99.92 Regular Price $119.99
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SIG SAUER MCX Rattler 5.56 NATO Complete Upper - 5.5"Special Price $1,824.99 Regular Price $1,999.99
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F-1 Firearms 5.56 NATO DuraBolt Bolt Carrier Group (BCG) - TTZ True BlackSpecial Price $219.92 Regular Price $289.95
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Sharps Bros Overthrow AR-15 Complete Lower Receiver w/o Stock - Gen 2Special Price $319.99 Regular Price $399.95
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Rainier Arms RUC DI 300BLK Partial Upper Receiver - 10.7"Special Price $400.00 Regular Price $500.00
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Sons of Liberty Gun Works M4-76 5.56 AR-15 Upper - 10.5"Special Price $779.92 Regular Price $855.00
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Breek Arms Warhammer Mod2 Micro .308/7.62 Ambidextrous Charging Handle - OD GreenSpecial Price $51.92 Regular Price $64.99
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Sharps Bros Showdown AR-15 Complete Lower Receiver W/O StockSpecial Price $319.99 Regular Price $399.95
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Rainier Arms Ambidextrous Safety Selector Switch - Standard / Short (45 Degree)Special Price $49.92 Regular Price $85.00
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Rainier Arms Precision Match Grade AR15 Nickel Boron Cam PinSpecial Price $9.92 Regular Price $14.99
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Mega Arms Orias M-LOK CHASSIS IN REM 700 LONG ACTION Type 2Special Price $399.92 Regular Price $767.00
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Sharps Bros Warthog AR-15 Complete Lower Receiver w/o stock - Gen 2Special Price $319.99 Regular Price $399.95
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Cross Machine Tool (CMT) Tactical AR-15 UHP15PDW INTEGRATED LOWER SYSTEM - BlackSpecial Price $499.92 Regular Price $659.00
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Strike Industries ISOTAB Charging Handle Extension - BlackSpecial Price $10.92 Regular Price $15.95
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Quarter Circle 10 Side Charging Small Frame (Glock Compatible) 9MM Builders KitSpecial Price $712.99 Regular Price $949.95
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Forward Controls Design URF V2 AR-15 Stripped Billet Upper Receiver - No Forward AssistSpecial Price $149.92 Regular Price $187.15
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Quarter Circle 10 Big Tex (GLF) Rear Charging .45ACP PCC Builders KitSpecial Price $701.99 Regular Price $935.95
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Rubber City Armory AR-15 5.56/.223 Bolt Carrier Group (BCG) – Black NitrideSpecial Price $149.92 Regular Price $189.00
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Iron City Rifleworks S2 Nitride Elite 5.56/.223/300BLK BCGSpecial Price $139.92 Regular Price $189.99
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Tactical Edge Arms 5.56 Midlength Complete Upper w/ WSR12 Rail - 14.5"Special Price $699.99 Regular Price $929.99
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Kaw Valley Precision 6 Position Mil-Spec Stock Completion Kit w/ Buffer - 4.3ozSpecial Price $49.92 Regular Price $59.95
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Andro Corp Industries AC-9 9mm Complete Lower Receiver - No StockSpecial Price $274.92 Regular Price $389.99
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Tactical Edge Arms MOD 0 AR-15 Complete Lower Receiver - No StockSpecial Price $249.92 Regular Price $349.99
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Andro Corp Industries ACI-15 AR-15 Assembled Upper ReceiverSpecial Price $73.92 Regular Price $109.99
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Airborne Arms Geronimo AR Trigger System - Straight TalonSpecial Price $129.92 Regular Price $179.95
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Rainier Arms 5.56 NATO Barrel - 6.75" Satin (Contract Overrun)Special Price $114.92 Regular Price $215.00
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Airborne Arms AAZ9 Warthog 9mm Linear Compensator - 1/2x36Special Price $59.92 Regular Price $84.95
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Airborne Arms Geronimo AR Trigger System - Extended Talon BlackSpecial Price $129.92 Regular Price $179.95
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Timney Triggers AR-15 Trigger - 75th Anniversary Limited Special EditionSpecial Price $149.92 Regular Price $199.99
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Spinta Precision AR-15 9mm Thermal Barrel - 8” Nitride (Rainier Arms Exclusive)Special Price $100.10 Regular Price $189.99
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Aero Precision M4E1 AR-15 Lower Receiver - Special Edition: Franklin SnakeSpecial Price $99.92 Regular Price $114.74
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Ascalon Arms CZ Scorpion EVO 3/3+ Ergon Billet Safety Levers Kit - Grey BlemSpecial Price $59.92 Regular Price $69.00
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Bootleg Four Position Adjustable .308/7.62/6.5CM Bolt CarrierSpecial Price $239.92 Regular Price $299.00
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Breek Arms Warhammer MOD2 .308/7.62 Ambidextrous Charging HandleSpecial Price $51.92 Regular Price $64.99
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Bravo Company MFG (BCM) AR-15 BCG & Upper Receiver ComboSpecial Price $244.99 Regular Price $318.00
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Sharps Bros THE JACK AR-15 Complete Lower Receiver w/o stock - Gen 2Special Price $319.99 Regular Price $399.95Out of stock
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Faxon Firearms Big Gunner .308 WIN, Rifle-Length, 4150 QPQ Nitride Barrel - 20"$238.28Out of stock
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Foxtrot Mike (FM) Products AR-15 Mike-15 Gen 2 .223 Wylde Complete Upper Receiver - 16" (Rainier Arms Exclusive)Special Price $624.95 Regular Price $699.95Out of stock
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Foxtrot Mike (FM) Products AR-15 5.56MM FM-15 Gen 2 Complete Upper Receiver - 13.9" (Rainier Arms Exclusive)Special Price $599.99 Regular Price $659.95Out of stock
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Knight's Armament Company (KAC) Triple Tap Enhanced 5.56mm Compensator - 1/2x28$591.38Out of stock
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Battle Arms Development Lightweight Low Profile Titanium Gas Block-Raw Titanium FinishSpecial Price $69.92 Regular Price $79.95Out of stock
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Sharps Bros Livewire AR-15 Complete Lower Receiver w/o StockSpecial Price $219.99 Regular Price $269.95Out of stock
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SIG SAUER MCX Rattler 300BLK Complete Upper - 5.5"Special Price $1,759.99 Regular Price $1,999.99Out of stock
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Primary Weapons Systems .223 Wylde MK1 MOD 2-M Complete Upper - 14.5" NO COMPENSATOR$1,299.95Out of stock
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Spinta Precision .223 Wylde Dissipator Barrel - 16" (Rainier Arms Exclusive)Special Price $149.99 Regular Price $199.99Out of stock
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Spinta Precision AR-15 9mm Thermal Barrel - 5.25” Nitride (Rainier Arms Exclusive)Special Price $77.99 Regular Price $149.99Out of stock
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Maxim Defense MDX 505 PDX 5.56 NATO Mil-Spec Complete Upper - 5.5" Urban Grey$1,165.50Out of stock
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Rainier Arms RUC 5.56 NATO DI Complete Upper - 16"Special Price $664.00 Regular Price $830.00Out of stock
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Forward Controls Design End Plate w/ Single QD PortSpecial Price $36.92 Regular Price $42.75Out of stock
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Rainier Arms / Rellim Arms AR-15 300BLK Take Down Upper Receiver Assembly - 8"$1,199.99Out of stock
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Ballistic Advantage Modern Series 5.56 Midlength Gov't Profile CMV Barrel - 16"$166.25Out of stock
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Spinta Precision AR-15 300BLK Cold Hammer Forged Barrel - 8" (Limited Production)Special Price $149.99 Regular Price $199.99Out of stock
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