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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. Milspec/GI A2 Flash Hider - 1/2x28
    Milspec/GI A2 Flash Hider - 1/2x28
    $8.00
    Out of stock
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  2. Aero Precision AR10/AR15 Fix It Kit
    Aero Precision AR10/AR15 Fix It Kit
    $17.99
    Out of stock
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  3. Aero Precision Low Profile Gas Block - .750 Nitride
    Aero Precision Low Profile Gas Block - .750 Nitride
    $35.99
    Out of stock
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  4. Centurion Arms AST AR-15 Advanced Sniper Trigger - 2-Stage
    Centurion Arms AST AR-15 Advanced Sniper Trigger - 2-Stage
    $88.82
    Out of stock
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  5. Primary Weapon Systems Enhanced Steel Body Buffer - Carbine H4/9mm (Suppressor Optimized)
    Primary Weapon Systems Enhanced Steel Body Buffer - Carbine H4/9mm (Suppressor Optimized)
    $84.96
    Out of stock
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  6. Aero Precision Upper Parts Kit
    Aero Precision Upper Parts Kit
    Out of stock
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  7. Primary Weapons Systems Enhanced Steel Body Buffer - Carbine H3 5.1 oz
    Primary Weapons Systems Enhanced Steel Body Buffer - Carbine H3 5.1 oz
    $49.95
    Out of stock
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  8. Battle Arms Development BAD-ASS Elite Ambidextrous Safety Selector
    Battle Arms Development BAD-ASS Elite Ambidextrous Safety Selector
    $74.95
    Out of stock
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  9. Battle Arms Development Lightweight Low Profile Steel Gas Block - .750 Black
    Battle Arms Development Lightweight Low Profile Steel Gas Block - .750 Black
    $35.99
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  10. Battle Arms Development Investment Cast Enhanced Bolt Catch - .308
    Battle Arms Development Investment Cast Enhanced Bolt Catch - .308
    $15.95
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  11. Aero Precision AR15 Lower Parts Kit Minus FCG, Trigger Guard, and Pistol Grip
    Aero Precision AR15 Lower Parts Kit Minus FCG, Trigger Guard, and Pistol Grip
    $40.00
    Out of stock
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  12. Strike Industries Rubber Over-Mold Pistol Grip - 25 Degree Black
    Strike Industries Rubber Over-Mold Pistol Grip - 25 Degree Black
    $22.95
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  13. Aero Precision Low Profile Adjustable Gas Block - .625
    Aero Precision Low Profile Adjustable Gas Block - .625
    $71.99
    Out of stock
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  14. Aero Precision AR15 BREACH Ambi Charging Handle - Black
    Aero Precision AR15 BREACH Ambi Charging Handle - Black
    Out of stock
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  15. Dead Air Sandman Flash Hider Front Cap - 5.56
    Dead Air Sandman Flash Hider Front Cap - 5.56
    $89.00
    Out of stock
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  16. James Madison Tactical (JMT) Anti-Rotation/Anti-Walk Pins
    James Madison Tactical (JMT) Anti-Rotation/Anti-Walk Pins
    $14.95
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  1. 5.5" 1 item
  2. 16" 4 items
  3. 18" 4 items
Caliber
  1. .223/5.56 2 items
  2. .30 Cal 5 items
  3. .308 1 item
  4. .338 1 item
  5. .458 Socom 1 item
  6. 300 Blackout 1 item
  7. 5.56 NATO 2 items
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  9. 6.5 Grendel 1 item
  10. 7.62x39 1 item
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  12. 8.6 Blackout 1 item
  13. 9mm 5 items
Category
  1. Receiver Parts 5 items
  2. Parts & Kits 60 items
  3. Rifle Barrels 1 item
  4. Buffer Systems 19 items
  5. Trigger Parts 16 items
  6. Gas Systems 18 items
  7. Muzzle Devices 36 items
  8. Bolt Parts 5 items
  9. Grips 35 items
  10. Charging Handles 19 items
  11. Rifle Handguards 15 items
  12. Stocks & Braces 7 items
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  10. .625 DIA 2 items
  11. .750 DIA 2 items
  12. .936 DIA 1 item
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  2. Black Nitride 1 item
  3. Cerakote 1 item
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  5. NiB-X 1 item
  6. Nickel Boron 1 item
  7. Nitride 4 items
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  10. Quench Polish Quench (QPQ) 1 item
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  1. .625" 2 items
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  3. .875" 1 item
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  3. Mid 5 items
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  5. Rifle 2 items
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  1. Absolute Co-Witness 1 item
Manufacturer
  1. A3 Tactical 5 items
  2. Advanced Armament Company (AAC) 1 item
  3. Aero Precision 12 items
  4. Aeroknox 7 items
  5. ALG Defense 1 item
  6. Angstadt Arms 3 items
  7. Apex Tactical Specialties 1 item
  8. Armaspec 8 items
  9. Arms Republic 4 items
  10. Ascalon Arms 3 items
  11. Brügger & Thomet (B&T) 1 item
  12. Ballistic Advantage 5 items
  13. Battle Arms Development 25 items
  14. Blackout Defense 1 item
  15. Blitzkrieg Components 1 item
  16. Bravo Company MFG (BCM) 1 item
  17. Centurion Arms 1 item
  18. Cross Machine Tool (CMT) 2 items
  19. Dead Air Armament 1 item
  20. Drew Meyers Defense 4 items
  21. Driven Arms Co. 3 items
  22. Elftmann Tactical 1 item
  23. Emissary Development 2 items
  24. Ergo Grips 7 items
  25. Faxon Firearms 5 items
  26. Fortis MFG 3 items
  27. Forward Controls Design 5 items
  28. Geissele 4 items
  29. Griffin Armament 5 items
  30. HB Industries 1 item
  31. HERA ARMS 4 items
  32. Hiperfire 3 items
  33. James Madison Tactical (JMT) 1 item
  34. JK Armament 2 items
  35. JMAC Customs 2 items
  36. JP Enterprises Inc 1 item
  37. Kinetic Development Group 4 items
  38. Knight’s Armament Company (KAC) 3 items
  39. KNS Precision 1 item
  40. Kalashnikov USA 1 item
  41. Krebs Customs 2 items
  42. Lantac 4 items
  43. Mad Pig 1 item
  44. Magpul Industries 10 items
  45. Midwest Industries 1 item
  46. NEMO Arms 1 item
  47. Next Level Armament 1 item
  48. Noveske 7 items
  49. Obsidian Arms 1 item
  50. Patriot Ordnance Factory (POF) 2 items
  51. Precision Armament 2 items
  52. Primary Weapon Systems 4 items
  53. Q, LLC 3 items
  54. Radian Weapons 3 items
  55. Rainier Arms, LLC 3 items
  56. SB Tactical 1 item
  57. Sharps Bros 1 item
  58. Sig Sauer 1 item
  59. Silencerco 7 items
  60. Sionics Weapon Systems 1 item
  61. SLR Rifleworks 1 item
  62. Sons of Liberty Gun Works 1 item
  63. Springer Precision 1 item
  64. Strike Industries 1 item
  65. Surefire 2 items
  66. Taran Tactical Innovations 1 item
  67. Troy Industries 1 item
  68. TruCalibre 3 items
  69. V Seven Weapon Systems 6 items
  70. VLTOR 2 items
  71. WMD Guns 2 items
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  1. CZ Scorpion 4 items
  2. Sig MPX 1 item
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  1. KeyMod 4 items
  2. M-LOK 24 items
  3. Picatinny 9 items
Option
  1. AK-47/74 3 items
  2. AR-10 4 items
  3. AR-15 28 items
  4. SRS-C 3.3 oz. 1 item
  5. SRS-H 3.8 oz. 1 item
  6. SRS-H2 4.7 oz. 1 item
  7. SRS-H3 5.6 oz. 1 item
  8. SRS-BB 5.7 oz. 1 item
  9. SRS-9mm 6.4 oz. 1 item
  10. SRS-AR10 5.7 oz. 1 item
  11. CZ 9 items
  12. Small Lever 1 item
  13. Large Lever 2 items
  14. Adjustable 3 items
  15. Non-Adjustable 10 items
Platform
  1. AR-15 4 items
  2. CZ-USA 4 items
  3. Sig Sauer 1 item
Price
  1. $0.00 - $9.99 10 items
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  6. $50.00 - $59.99 21 items
  7. $60.00 - $69.99 18 items
  8. $70.00 - $79.99 31 items
  9. $80.00 - $89.99 23 items
  10. $90.00 and above 25 items
Product Type
  1. 80% Lower 2 items
  2. Accessory 1 item
  3. Angled Grip 4 items
  4. Anti Walk Pins 3 items
  5. AR-10 / LR 308 Charging Handle 1 item
  6. AR-15 Assembled Upper Receiver 1 item
  7. AR-15 Charging Handle 11 items
  8. AR-15 Stripped Lower Receiver 2 items
  9. AR-15 Stripped Upper Receiver 1 item
  10. AR-9 Upper Receiver 1 item
  11. Barrel 1 item
  12. Blast Shield 1 item
  13. Bolt 2 items
  14. Bolt Catch 6 items
  15. Brace 1 item
  16. Buffer 6 items
  17. Buffer Kit 2 items
  18. Buffer Tube 9 items
  19. Cam Pin 1 item
  20. Charging Handle 4 items
  21. Compensator 5 items
  22. Dust Cover 1 item
  23. End Cap 1 item
  24. End Plate 2 items
  25. Firing Pin 2 items
  26. Flash Hider 8 items
  27. Forearm Accesory 4 items
  28. Forward Assist 1 item
  29. Gas Block 15 items
  30. Gas Tube 2 items
  31. Grip Module 1 item
  32. Gunsmithing Tool 1 item
  33. Handguard 2 items
  34. Handstop 15 items
  35. Lower Parts Kit 7 items
  36. Magazine Catch 2 items
  37. Magazine Release 6 items
  38. Magwell 1 item
  39. Muzzle Brake 20 items
  40. Muzzle Device Accessory 2 items
  41. Patch 1 item
  42. Pistol Grip 8 items
  43. Port Door 1 item
  44. Port Door Rod 1 item
  45. Rail Adapter 1 item
  46. Rail Panel 3 items
  47. Rail Section 1 item
  48. Recoil Spring 1 item
  49. Retainer Pin 2 items
  50. Safety Selector 14 items
  51. Shim Set 1 item
  52. Sling Mount 2 items
  53. Stock 3 items
  54. Stock Adapter 3 items
  55. Take Down / Pivot Pins 6 items
  56. Trigger 7 items
  57. Trigger Guard 3 items
  58. Trigger Spring 1 item
  59. Upper Parts Kit 1 item
  60. Vertical Grip 7 items
  61. Weight 1 item
Rail Length
  1. 10" 4 items
  2. 12" 4 items
Size
  1. 3 Slot 2 items
  2. 5 Slot 2 items
  3. 7 Slot 2 items
  4. 9 Slot 8 items
Thread Pitch
  1. 1/2x28 19 items
  2. 5/8x24 7 items
  3. 5/8x32 1 item
  4. 11/16x24 1 item
  5. M24x1.5 RH 1 item
Threaded
  1. Yes 2 items
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  1. In stock 1 item
  2. Out of stock 238 items Remove This Item
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