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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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  1. Ballistic Advantage Modern Series 5.56 SPR Barrel - 18"
    Ballistic Advantage Modern Series 5.56 SPR Barrel - 18"
    $175.75
    Out of stock
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  2. Midwest Industries Enhanced AR-15 Single Stage Trigger w/ Anti-Walk Pins - 3.5lbs
    Midwest Industries Enhanced AR-15 Single Stage Trigger w/ Anti-Walk Pins - 3.5lbs
    $167.95
    Out of stock
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  3. Aero Precision AR15 Enhanced Carbine Buffer Tube Kit - H2
    Aero Precision AR15 Enhanced Carbine Buffer Tube Kit - H2
    $104.99
    Out of stock
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  4. Ballistic Advantage Modern Series 5.56 Government Profile Midlength AR 15 Barrel - 14.5"
    Ballistic Advantage Modern Series 5.56 Government Profile Midlength AR 15 Barrel - 14.5"
    $161.50
    Out of stock
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  5. Ballistic Advantage Modern Series 300BLK Barrel - 10.5"
    Ballistic Advantage Modern Series 300BLK Barrel - 10.5"
    $156.75
    Out of stock
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  6. Ballistic Advantage Modern Series 5.56 Government Barrel - 12.5"
    Ballistic Advantage Modern Series 5.56 Government Barrel - 12.5"
    $152.00
    Out of stock
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  7. Fortis MFG AR-15 REV 2.0 Free Float Rail System - FDE
    Fortis MFG AR-15 REV 2.0 Free Float Rail System - FDE
    Out of stock
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  8. Fortis MFG AR-15 REV 2.0 Free Float Rail System - OD Green
    Fortis MFG AR-15 REV 2.0 Free Float Rail System - OD Green
    Out of stock
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  9. Surefire Socom 5.56mm 4-Prong Flash Hider - 1/2x28
    Surefire Socom 5.56mm 4-Prong Flash Hider - 1/2x28
    $152.00
    Out of stock
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  10. Midwest Industries Picatinny Side Folding Arm - Pistol Brace Compatible
    Midwest Industries Picatinny Side Folding Arm - Pistol Brace Compatible
    $146.95
    Out of stock
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  11. Midwest Industries Slim Line AR-15 M-Lok Handguard - 10.5"
    Midwest Industries Slim Line AR-15 M-Lok Handguard - 10.5"
    $162.95
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  12. Ballistic Advantage AR-15 Enhanced Upper Receiver
    Ballistic Advantage AR-15 Enhanced Upper Receiver
    $113.99
    Out of stock
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  13. Ballistic Advantage BA-10 Upper Receiver
    Ballistic Advantage BA-10 Upper Receiver
    $142.50
    Out of stock
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  14. Rainier Arms Exclusive Spinta Precision .223 Wylde Dissipator Barrel - 16" (Rainier Arms Exclusive)
    Spinta Precision .223 Wylde Dissipator Barrel - 16" (Rainier Arms Exclusive)
    Special Price $149.99 Regular Price $199.99
    Out of stock
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  15. Faxon Firearms FF-22 Receiver for Ruger 10/22
    Faxon Firearms FF-22 Receiver for Ruger 10/22
    $170.20
    Out of stock
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  16. Midwest Industries Picatinny Side Folder - Milspec Buffer Tube
    Midwest Industries Picatinny Side Folder - Milspec Buffer Tube
    $146.95
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Barrel Length
  1. 6" 2 items
  2. 7.5" 1 item
  3. 8" 2 items
  4. 8.3" 1 item
  5. 8.5" 2 items
  6. 9" 1 item
  7. 10.5" 3 items
  8. 11" 1 item
  9. 11.5" 1 item
  10. 12.5" 1 item
  11. 16" 3 items
  12. 18" 3 items
  13. 20" 3 items
Caliber
  1. .223/5.56 1 item
  2. .223 Wylde 2 items
  3. .30 Cal 1 item
  4. .308 1 item
  5. .38/.357 Magnum 1 item
  6. .45 ACP 1 item
  7. 300 Blackout 6 items
  8. 5.56 NATO 18 items
  9. 6.5 Creedmoor 1 item
  10. 6.5 Grendel 1 item
  11. 7.62mm 3 items
  12. 7.62x39 1 item
  13. 7.62x51 1 item
  14. 9mm 8 items
Category
  1. Receiver Parts 32 items
  2. Parts & Kits 5 items
  3. Rifle Barrels 21 items
  4. Buffer Systems 8 items
  5. Trigger Parts 14 items
  6. Gas Systems 1 item
  7. Muzzle Devices 32 items
  8. Bolt Parts 20 items
  9. Grips 3 items
  10. Charging Handles 4 items
  11. Rifle Handguards 24 items
  12. Stocks & Braces 14 items
Color
Configuration
  1. AR-15 3 items
  2. Carbine 1 item
  3. Curved 3 items
  4. Flat 3 items
  5. M-LOK 1 item
  6. .750 DIA 2 items
Finish
  1. Black 1 item
  2. Black Nitride 2 items
  3. Cerakote 2 items
  4. DLC 2 items
  5. Melonite 1 item
  6. Nickel Boron 4 items
  7. Nitride 5 items
  8. Phosphate 2 items
  9. Anodize 10 items
  10. Titanium Nitride (TiN) 1 item
Gas Block Diameter
  1. .625" 1 item
  2. .750" 9 items
Gas Length
  1. Pistol 5 items
  2. Carbine 2 items
  3. Mid 1 item
  4. Intermediate 2 items
  5. Rifle 1 item
Inside Diameter
  1. 1.315" 3 items
  2. 1.34" 1 item
  3. 1.42" 1 item
  4. 1.5" 1 item
Is Firearms?
  1. No 178 items
Manufacturer
  1. Aero Precision 20 items
  2. Aeroknox 1 item
  3. ALG Defense 1 item
  4. Angstadt Arms 3 items
  5. Ballistic Advantage 12 items
  6. Battle Arms Development 3 items
  7. Blitzkrieg Components 1 item
  8. Bootleg 1 item
  9. Bravo Company MFG (BCM) 1 item
  10. Centurion Arms 2 items
  11. Cross Machine Tool (CMT) 6 items
  12. F5 MFG 1 item
  13. Faxon Firearms 15 items
  14. Fortis MFG 3 items
  15. Gear Head Works 3 items
  16. Geissele 2 items
  17. Grey Birch MFG 1 item
  18. Griffin Armament 1 item
  19. HB Industries 1 item
  20. HERA ARMS 3 items
  21. Hiperfire 8 items
  22. HUXWRX 5 items
  23. Icon Defense 1 item
  24. JMAC Customs 5 items
  25. JP Enterprises Inc 3 items
  26. Kinetic Development Group 1 item
  27. Knight’s Armament Company (KAC) 4 items
  28. Kalashnikov USA 1 item
  29. KynSHOT 2 items
  30. Lantac 7 items
  31. Midwest Industries 12 items
  32. NEMO Arms 1 item
  33. Next Level Armament 1 item
  34. Noveske 2 items
  35. Precision Armament 2 items
  36. Primary Weapon Systems 1 item
  37. Q, LLC 1 item
  38. Rainier Arms, LLC 6 items
  39. SB Tactical 2 items
  40. Sharps Bros 1 item
  41. Sig Sauer 1 item
  42. Silencerco 1 item
  43. Sionics Weapon Systems 1 item
  44. Sons of Liberty Gun Works 2 items
  45. Spinta Precision 3 items
  46. Stern Defense 3 items
  47. Surefire 6 items
  48. Triggertech 2 items
  49. Troy Industries 1 item
  50. Tyrant Designs 4 items
  51. VLTOR 2 items
  52. WMD Guns 2 items
Model
  1. IWI Galil 1 item
  2. Sig MCX 2 items
Mount
  1. M-LOK 12 items
  2. Picatinny 4 items
Option
  1. AK-47/74 1 item
  2. AR-9 5 items
  3. AR-10 3 items
  4. AR-15 41 items
  5. Glock 1 item
  6. Heckler & Koch 1 item
Platform
  1. 10-22 1 item
  2. AR-15 12 items
  3. AK47/74 1 item
  4. IWI 1 item
  5. Sig Sauer 3 items
Price
  1. $100.00 - $109.99 12 items
  2. $110.00 - $119.99 18 items
  3. $120.00 - $129.99 21 items
  4. $130.00 - $139.99 17 items
  5. $140.00 - $149.99 25 items
  6. $150.00 - $159.99 24 items
  7. $160.00 - $169.99 17 items
  8. $170.00 - $179.99 18 items
  9. $180.00 - $189.99 10 items
  10. $190.00 and above 16 items
Product Type
  1. 10/22 Receiver 1 item
  2. AR-10 / LR 308 Charging Handle 1 item
  3. AR-10 Handguard 3 items
  4. AR-15 Assembled Upper Receiver 1 item
  5. AR-15 Charging Handle 2 items
  6. AR-15 Handguard 11 items
  7. AR-15 Stripped Lower Receiver 13 items
  8. AR-15 Stripped Upper Receiver 13 items
  9. AR-9 Lower Receiver 2 items
  10. Barrel 20 items
  11. Blast Shield 1 item
  12. Bolt 3 items
  13. Bolt Carrier Group 18 items
  14. Brace 4 items
  15. Buffer 3 items
  16. Buffer Kit 2 items
  17. Buffer Spring 1 item
  18. Buffer Tube 1 item
  19. Builders Kit 1 item
  20. Charging Handle 1 item
  21. Compensator 1 item
  22. Flash Hider 10 items
  23. Handguard 10 items
  24. Lower Parts Kit 2 items
  25. Muzzle Brake 16 items
  26. Muzzle Device Accessory 4 items
  27. Pistol Grip 3 items
  28. Piston System 1 item
  29. Rail Section 1 item
  30. Safety Selector 1 item
  31. Silent Captured Spring 1 item
  32. Stock 3 items
  33. Stock Accessory 3 items
  34. Stock Adapter 4 items
  35. Trigger 14 items
Rail Length
  1. 3" 1 item
  2. 4" 1 item
  3. 5.5" 1 item
  4. 6.0" 2 items
  5. 6.7" 4 items
  6. 7" 1 item
  7. 7.25" 1 item
  8. 8.25" 1 item
  9. 9" 2 items
  10. 9.5" 3 items
  11. 9.6" 2 items
  12. 10.5" 4 items
  13. 12" 2 items
  14. 12.4" 2 items
  15. 12.5" 1 item
  16. 12.625" 1 item
  17. 13" 3 items
  18. 13.7" 3 items
  19. 13.8" 2 items
  20. 15" 10 items
  21. 15.3" 2 items
Size
  1. BACK STRAP:Large 1 item
  2. BACK STRAP:Medium 2 items
  3. 9 Slot 2 items
Thread Pitch
  1. 1.125x28 1 item
  2. 1/2x28 25 items
  3. 5/8x24 11 items
Threaded
  1. Yes 9 items
Twist Rate
  1. 1:5 1 item
  2. 1:7 1 item
  3. 1:8 4 items
  4. 1:10 2 items
Stock Status
  1. In stock 1 item
  2. Out of stock 177 items Remove This Item
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