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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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Barrel Length
  1. 5.25" 1 item
  2. 5.5" 1 item
  3. 10.3" 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 5 items
  8. 5.56mm 3 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 7 items
Category
  1. Receiver Parts 6 items
  2. Parts & Kits 93 items
  3. Barrels 2 items
  4. Buffer Systems 15 items
  5. Trigger Parts 18 items
  6. Gas Systems 22 items
  7. Muzzle Devices 53 items
  8. Bolt Parts 8 items
  9. Grips 46 items
  10. Charging Handles 23 items
  11. Rifle Handguards 20 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 4 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 7 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 2 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 9 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 4 items
  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. Blackout Defense 1 item
  16. Blitzkrieg Components 2 items
  17. Bravo Company MFG (BCM) 4 items
  18. Cross Machine Tool (CMT) 2 items
  19. Daniel Defense 1 item
  20. Dead Air Armament 1 item
  21. Drew Meyers Defense 2 items
  22. Driven Arms Co. 2 items
  23. Elftmann Tactical 1 item
  24. Ergo Grips 7 items
  25. Faxon Firearms 7 items
  26. Flatline Fiber Co 1 item
  27. Fortis MFG 8 items
  28. Forward Controls Design 6 items
  29. Geissele 3 items
  30. Griffin Armament 11 items
  31. HB Industries 6 items
  32. HERA ARMS 4 items
  33. Hiperfire 3 items
  34. James Madison Tactical (JMT) 1 item
  35. JK Armament 3 items
  36. JMAC Customs 6 items
  37. JP Enterprises Inc 3 items
  38. Kinetic Development Group 4 items
  39. Knight’s Armament Company (KAC) 2 items
  40. KNS Precision 4 items
  41. Kalashnikov USA 1 item
  42. Kratos Design Group 1 item
  43. Krebs Customs 4 items
  44. Lantac 3 items
  45. Leitner-Wise 1 item
  46. Mad Pig 2 items
  47. Mag-Pod 1 item
  48. Magpul Industries 15 items
  49. Midwest Industries 2 items
  50. NEMO Arms 1 item
  51. Next Level Armament 6 items
  52. Noveske 9 items
  53. Obsidian Arms 1 item
  54. Patriot Ordnance Factory (POF) 3 items
  55. Precision Armament 3 items
  56. Primary Weapon Systems 1 item
  57. Q, LLC 6 items
  58. Radian Weapons 1 item
  59. Rainier Arms, LLC 1 item
  60. Reptilia Corp 1 item
  61. Rise Armament 2 items
  62. RS Regulate 1 item
  63. SB Tactical 1 item
  64. Sig Sauer 1 item
  65. Silencerco 5 items
  66. Sionics Weapon Systems 1 item
  67. SLR Rifleworks 1 item
  68. Sons of Liberty Gun Works 2 items
  69. Spinta Precision 1 item
  70. Springer Precision 1 item
  71. Stag Arms 1 item
  72. Strike Industries 1 item
  73. Superlative Arms 1 item
  74. Surefire 2 items
  75. Taran Tactical Innovations 2 items
  76. Triggertech 1 item
  77. Troy Industries 1 item
  78. TruCalibre 4 items
  79. True North Concepts 2 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 8 items
  3. H&K MP5K 1 item
  4. Sig MPX 1 item
Mount
  1. KeyMod 7 items
  2. M-LOK 29 items
  3. Picatinny 16 items
Option
  1. AK-47/74 2 items
  2. AR-10 6 items
  3. AR-15 39 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 13 items
Platform
  1. AR-15 12 items
  2. CZ 8 items
  3. H&K 2 items
  4. Sig Sauer 1 item
Product Type
  1. 80% Lower 2 items
  2. Accessory 1 item
  3. Angled Grip 6 items
  4. Anti Walk Pins 5 items
  5. AR-10 / LR 308 Charging Handle 1 item
  6. AR-15 Assembled Upper Receiver 1 item
  7. AR-15 Barrel 2 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. AR-9 Upper Receiver 1 item
  12. Barrel Nut 3 items
  13. Blast Shield 1 item
  14. Bolt 2 items
  15. Bolt Catch 8 items
  16. Brace 1 item
  17. Brace Strap 1 item
  18. Buffer 6 items
  19. Buffer Kit 2 items
  20. Buffer Spring 1 item
  21. Buffer Tube 6 items
  22. Cam Pin 2 items
  23. Castle Nut / End Plate 2 items
  24. Charging Handle 9 items
  25. Compensator 8 items
  26. Dust Cover 3 items
  27. End Cap 2 items
  28. End Plate 2 items
  29. Firing Pin 3 items
  30. Flash Hider 5 items
  31. Forearm Accesory 5 items
  32. Forward Assist 3 items
  33. Front Sight 1 item
  34. Gas Block 20 items
  35. Gas Tube 1 item
  36. Grip Accessory 1 item
  37. Grip Module 1 item
  38. Gunsmithing Tool 1 item
  39. Handguard 3 items
  40. Handstop 14 items
  41. Lower Parts Kit 8 items
  42. Magazine Catch 2 items
  43. Magazine Release 8 items
  44. Magwell 2 items
  45. Muzzle Brake 32 items
  46. Muzzle Device Accessory 7 items
  47. Parts Kit 1 item
  48. Patch 1 item
  49. Pistol Grip 12 items
  50. Port Door Rod 4 items
  51. Rail Adapter 2 items
  52. Rail Cover 2 items
  53. Rail Panel 3 items
  54. Rail Section 1 item
  55. Recoil Spring 1 item
  56. Retainer Pin 3 items
  57. Safety Selector 23 items
  58. Shim Set 2 items
  59. Sight Post 2 items
  60. Sling Mount 2 items
  61. Spring 1 item
  62. Stock 3 items
  63. Stock Adapter 4 items
  64. Take Down / Pivot Pins 8 items
  65. Trigger 6 items
  66. Trigger / Hammer Pins 2 items
  67. Trigger Guard 3 items
  68. Trigger Spring 1 item
  69. Upper Parts Kit 1 item
  70. Vertical Grip 12 items
Rail Length
  1. 10" 6 items
  2. 12" 9 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. 1.375-24 1 item
  2. 1/2x28 (9mm) 6 items
  3. 1/2x28 (.22 cal) 25 items
  4. 5/8x24 (.30 cal) 8 items
  5. 5/8x32 1 item
  6. 11/16x24 1 item
  7. M14x1 LH 1 item
  8. M18x1.5 2 items
  9. M24x1.5 RH 1 item
Threaded
  1. Yes 7 items
Twist Rate
  1. 1:10 2 items
Stock Status
  1. In stock 6 items
  2. Out of stock 315 items Remove This Item
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