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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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Items 17-32 of 317

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  2. Aero Precision AR-15 Carbine Buffer Kit
    Aero Precision AR-15 Carbine Buffer Kit
    $67.99
    Out of stock
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  4. Milspec/GI A2 Flash Hider - 1/2x28
    Milspec/GI A2 Flash Hider - 1/2x28
    $8.00
    Out of stock
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  5. Aero Precision AR10/AR15 Fix It Kit
    Aero Precision AR10/AR15 Fix It Kit
    $17.99
    Out of stock
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  6. 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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  8. Aero Precision Upper Parts Kit
    Aero Precision Upper Parts Kit
    Out of stock
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  9. Triggertech AR 45/90 Degree Safety Selector
    Triggertech AR 45/90 Degree Safety Selector
    Out of stock
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  14. KNS Precision Galil Ace Picatinny Stock Adapter
    KNS Precision Galil Ace Picatinny Stock Adapter
    $35.00
    Out of stock
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  15. Griffin Armament M4SD Hammer Comp 5.56mm
    Griffin Armament M4SD Hammer Comp 5.56mm
    $89.95
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Items 17-32 of 317

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  1. Price $0.00 - $99.99 Remove This Item
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Barrel Length
  1. 5.25" 1 item
  2. 5.5" 1 item
  3. 7.25" 1 item
  4. 16" 8 items
  5. 18" 5 items
Caliber
  1. .223/5.56 4 items
  2. .30 Cal 3 items
  3. .308 1 item
  4. .338 1 item
  5. .458 Socom 1 item
  6. 300 Blackout 2 items
  7. 5.56 NATO 4 items
  8. 5.56mm 2 items
  9. 6.5 Grendel 1 item
  10. 7.62x39 1 item
  11. 7.62x51 2 items
  12. 8.6 Blackout 2 items
  13. 9mm 8 items
Category
  1. Receiver Parts 5 items
  2. Parts & Kits 97 items
  3. Barrels 3 items
  4. Buffer Systems 16 items
  5. Trigger Parts 16 items
  6. Gas Systems 23 items
  7. Muzzle Devices 52 items
  8. Bolt Parts 8 items
  9. Grips 41 items
  10. Charging Handles 23 items
  11. Rifle Handguards 19 items
  12. Stocks & Braces 10 items
  13. MILSPEC Parts 4 items
Color
Configuration
  1. AR-10 2 items
  2. AR-15 8 items
  3. Gen 1-3 1 item
  4. GEN 2 1 item
  5. Left 1 item
  6. Left Hand 1 item
  7. M-LOK 5 items
  8. .625 DIA 3 items
  9. .750 DIA 5 items
  10. .936 DIA 1 item
Finish
  1. Black 4 items
  2. Black Nitride 1 item
  3. Cerakote 1 item
  4. DLC 1 item
  5. Melonite 1 item
  6. NiB-X 1 item
  7. Nitride 5 items
  8. Nitromet 1 item
  9. Red 1 item
  10. Anodize 8 items
  11. Quench Polish Quench (QPQ) 2 items
Gas Block Diameter
  1. .625" 2 items
  2. .750" 10 items
  3. .875" 1 item
Gas System Length
  1. Blowback 3 items
  2. Pistol 2 items
  3. Mid 6 items
  4. Intermediate 5 items
  5. Rifle 1 item
Height
  1. Absolute Co-Witness 2 items
Manufacturer
  1. A3 Tactical 6 items
  2. Accu-Tac 1 item
  3. Advanced Armament Company (AAC) 1 item
  4. Aero Precision 12 items
  5. Aeroknox 7 items
  6. Angstadt Arms 3 items
  7. Apex Tactical Specialties 1 item
  8. Armaspec 9 items
  9. Arms Republic 1 item
  10. Ascalon Arms 4 items
  11. Brügger & Thomet (B&T) 1 item
  12. B5 Systems 1 item
  13. Ballistic Advantage 5 items
  14. Battle Arms Development 24 items
  15. Blitzkrieg Components 2 items
  16. Bravo Company MFG (BCM) 4 items
  17. Cross Machine Tool (CMT) 2 items
  18. Dead Air Armament 1 item
  19. Drew Meyers Defense 2 items
  20. Driven Arms Co. 1 item
  21. Elftmann Tactical 1 item
  22. Ergo Grips 7 items
  23. Faxon Firearms 7 items
  24. Flatline Fiber Co 1 item
  25. Fortis MFG 6 items
  26. Forward Controls Design 10 items
  27. Geissele 2 items
  28. Griffin Armament 13 items
  29. HB Industries 6 items
  30. HERA ARMS 4 items
  31. Hiperfire 3 items
  32. HUXWRX 1 item
  33. James Madison Tactical (JMT) 1 item
  34. JK Armament 3 items
  35. JMAC Customs 5 items
  36. JP Enterprises Inc 2 items
  37. Kinetic Development Group 4 items
  38. Knight’s Armament Company (KAC) 2 items
  39. KNS Precision 4 items
  40. Kalashnikov USA 1 item
  41. Kratos Design Group 1 item
  42. Krebs Customs 4 items
  43. Lantac 3 items
  44. Leitner-Wise 1 item
  45. Mad Pig 2 items
  46. Mag-Pod 1 item
  47. Magpul Industries 16 items
  48. Midwest Industries 2 items
  49. NEMO Arms 1 item
  50. Next Level Armament 6 items
  51. Noveske 9 items
  52. Obsidian Arms 1 item
  53. Patriot Ordnance Factory (POF) 4 items
  54. Precision Armament 3 items
  55. Primary Weapon Systems 1 item
  56. Q, LLC 6 items
  57. R&D Precision 1 item
  58. Radian Weapons 1 item
  59. Rainier Arms, LLC 1 item
  60. Rainier Industries 1 item
  61. Reptilia Corp 1 item
  62. Rise Armament 1 item
  63. RS Regulate 1 item
  64. SB Tactical 1 item
  65. Sig Sauer 1 item
  66. Silencerco 6 items
  67. Sionics Weapon Systems 1 item
  68. SLR Rifleworks 1 item
  69. Sons of Liberty Gun Works 2 items
  70. Spinta Precision 1 item
  71. Springer Precision 1 item
  72. Stag Arms 1 item
  73. Strike Industries 2 items
  74. Superlative Arms 1 item
  75. Surefire 2 items
  76. Taran Tactical Innovations 2 items
  77. Triggertech 1 item
  78. Troy Industries 1 item
  79. TruCalibre 4 items
  80. Tyrant Designs 1 item
  81. V Seven Weapon Systems 26 items
  82. VLTOR 4 items
  83. WMD Guns 3 items
Model
  1. CZ Bren 2 items
  2. CZ Scorpion 9 items
  3. H&K MP5K 1 item
  4. Sig MPX 1 item
Mount
  1. KeyMod 7 items
  2. M-LOK 26 items
  3. Picatinny 12 items
Option
  1. AK-47/74 2 items
  2. AR-10 6 items
  3. AR-15 38 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 12 items
  12. Small Lever 1 item
  13. Large Lever 2 items
  14. Green Laser 1 item
  15. Adjustable 4 items
  16. Non-Adjustable 14 items
Platform
  1. AR-15 11 items
  2. CZ 9 items
  3. H&K 2 items
  4. Sig Sauer 1 item
Price
  1. $0.00 - $9.99 15 items
  2. $10.00 - $19.99 32 items
  3. $20.00 - $29.99 30 items
  4. $30.00 - $39.99 42 items
  5. $40.00 - $49.99 35 items
  6. $50.00 - $59.99 36 items
  7. $60.00 - $69.99 29 items
  8. $70.00 - $79.99 38 items
  9. $80.00 - $89.99 27 items
  10. $90.00 and above 33 items
Product Type
  1. 80% Lower 2 items
  2. Accessory 1 item
  3. Angled Grip 4 items
  4. Anti Walk Pins 4 items
  5. AR-10 / LR 308 Charging Handle 1 item
  6. AR-15 Assembled Upper Receiver 1 item
  7. AR-15 Barrel 3 items
  8. AR-15 Charging Handle 10 items
  9. AR-15 Stripped Lower Receiver 2 items
  10. AR-15 Stripped Upper Receiver 2 items
  11. Barrel Nut 3 items
  12. Blast Shield 1 item
  13. Bolt 2 items
  14. Bolt Catch 8 items
  15. Brace 1 item
  16. Brace Strap 1 item
  17. Buffer 6 items
  18. Buffer Kit 2 items
  19. Buffer Spring 1 item
  20. Buffer Tube 7 items
  21. Cam Pin 2 items
  22. Castle Nut / End Plate 2 items
  23. Charging Handle 9 items
  24. Compensator 9 items
  25. Dust Cover 3 items
  26. End Cap 2 items
  27. End Plate 4 items
  28. Firing Pin 3 items
  29. Flash Hider 5 items
  30. Forearm Accesory 5 items
  31. Forward Assist 4 items
  32. Gas Block 21 items
  33. Gas Tube 1 item
  34. Grip Accessory 1 item
  35. Grip Module 1 item
  36. Gunsmithing Tool 1 item
  37. Handguard 3 items
  38. Handstop 12 items
  39. Lower Parts Kit 8 items
  40. Magazine Catch 2 items
  41. Magazine Release 8 items
  42. Magwell 3 items
  43. Muzzle Brake 31 items
  44. Muzzle Device Accessory 6 items
  45. Patch 1 item
  46. Pistol Grip 12 items
  47. Port Door Rod 4 items
  48. Rail Adapter 2 items
  49. Rail Cover 2 items
  50. Rail Panel 2 items
  51. Rail Section 1 item
  52. Recoil Spring 1 item
  53. Retainer Pin 3 items
  54. Safety Selector 24 items
  55. Shim Set 3 items
  56. Sight Post 2 items
  57. Sling Mount 2 items
  58. Spring 1 item
  59. Stock 3 items
  60. Stock Adapter 4 items
  61. Take Down / Pivot Pins 7 items
  62. Trigger 6 items
  63. Trigger / Hammer Pins 1 item
  64. Trigger Guard 3 items
  65. Trigger Spring 1 item
  66. Upper Parts Kit 1 item
  67. Vertical Grip 11 items
Rail Length
  1. 10" 6 items
  2. 12" 7 items
Size
  1. 3 Slot 2 items
  2. 5 Slot 2 items
  3. 7 Slot 2 items
  4. 9 Slot 13 items
Thread Pitch
  1. 1/2x28 (9mm) 8 items
  2. 1/2x28 (.22 cal) 24 items
  3. 5/8x24 (.30 cal) 10 items
  4. 5/8x32 1 item
  5. 11/16x24 1 item
  6. M18x1.5 2 items
  7. M24x1.5 RH 1 item
Threaded
  1. Yes 6 items
Twist Rate
  1. 1:10 3 items
Stock Status
  1. Out of stock 317 items Remove This Item
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