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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. 3.1" 1 item
  2. 4" 1 item
  3. 4.5" 2 items
  4. 5.25" 1 item
  5. 5.5" 1 item
  6. 6" 1 item
  7. 7" 2 items
  8. 7.25" 1 item
  9. 7.5" 1 item
  10. 8" 1 item
  11. 16" 7 items
  12. 18" 8 items
Caliber
  1. .22 Cal 2 items
  2. .223/5.56 8 items
  3. .223 Rem 1 item
  4. .30 Cal 7 items
  5. .308 4 items
  6. 5.56X45 1 item
  7. 5.56 NATO 8 items
  8. 5.56mm 4 items
  9. 7.62mm 1 item
  10. 7.62x51 1 item
  11. 9mm 23 items
Category
  1. Receiver Parts 12 items
  2. Parts & Kits 188 items
  3. Barrels 10 items
  4. Buffer Systems 33 items
  5. Trigger Parts 37 items
  6. Gas Systems 32 items
  7. Muzzle Devices 108 items
  8. Bolt Parts 14 items
  9. Grips 124 items
  10. Charging Handles 47 items
  11. Rifle Handguards 42 items
  12. Stocks & Braces 68 items
  13. MILSPEC Parts 43 items
Color
Configuration
  1. 90 Degree 1 item
  2. AR-10 1 item
  3. AR-15 10 items
  4. Cross 1 item
  5. Curved 1 item
  6. Flaming Pig 1 item
  7. Flat 1 item
  8. Gen 3 1 item
  9. Ghetto Blaster 1 item
  10. M-LOK 4 items
  11. Normal CQR 2 items
  12. Restricted CQR 2 items
  13. Rifle 1 item
  14. Right Hand 1 item
  15. .625 DIA 5 items
  16. .750 DIA 5 items
  17. .800 DIA 2 items
  18. .875 DIA 3 items
  19. .936 DIA 3 items
  20. Large Latch 1 item
  21. Medium Latch 1 item
  22. Small Latch 1 item
Finish
  1. Bead Blast Stainless Steel 1 item
  2. Black 13 items
  3. Blue 1 item
  4. DLC 3 items
  5. FDE 3 items
  6. Gold 1 item
  7. Grey 1 item
  8. Melonite 1 item
  9. NiB-X 3 items
  10. Nickel Boron 3 items
  11. Nitride 6 items
  12. Nitromet 6 items
  13. Phosphate 1 item
  14. Red 3 items
  15. Anodize 15 items
Gas Block Diameter
  1. .625" 6 items
  2. .750" 14 items
  3. .875" 5 items
  4. .936" 5 items
Gas System Length
  1. Blowback 7 items
  2. Pistol -1 2 items
  3. Pistol 7 items
  4. Carbine 5 items
  5. Micro 1 item
  6. Mid 11 items
  7. Intermediate 12 items
  8. Patrol 1 item
  9. Rifle 4 items
  10. Rifle +1 2 items
  11. Rifle +2 2 items
Height
  1. Absolute Co-Witness 2 items
  2. Low 1 item
  3. Medium 1 item
  4. High 1 item
Inside Diameter
  1. 1.385" 1 item
Magazine Capacity
  1. 32rd 1 item
Manufacturer
  1. A3 Tactical 12 items
  2. Accu-Tac 1 item
  3. Advanced Armament Company (AAC) 3 items
  4. Aero Precision 3 items
  5. Airborne Arms 1 item
  6. ALG Defense 4 items
  7. Andro Corp Industries 4 items
  8. Angstadt Arms 4 items
  9. Apex Tactical Specialties 4 items
  10. Arisaka 6 items
  11. Armaspec 2 items
  12. Arms Republic 5 items
  13. Ascalon Arms 6 items
  14. B5 Systems 12 items
  15. Battle Arms Development 10 items
  16. Black River MFG 1 item
  17. Blitzkrieg Components 13 items
  18. Bootleg 1 item
  19. Bravo Company MFG (BCM) 35 items
  20. Brigand Arms 1 item
  21. Centurion Arms 4 items
  22. Chisel Machining 1 item
  23. Cobalt Kinetics 1 item
  24. Cross Machine Tool (CMT) 6 items
  25. Daniel Defense 2 items
  26. Dead Air Armament 5 items
  27. Die Free Co 2 items
  28. Drew Meyers Defense 6 items
  29. Driven Arms Co. 15 items
  30. Eartune 1 item
  31. Elftmann Tactical 1 item
  32. Emissary Development 6 items
  33. Ergo Grips 1 item
  34. F-1 Firearms 2 items
  35. Faxon Firearms 3 items
  36. Fortis MFG 30 items
  37. Forward Controls Design 68 items
  38. Gear Head Works 2 items
  39. Geissele 6 items
  40. Grey Ghost Precision 1 item
  41. Griffin Armament 9 items
  42. Half Cocked Arms (HCA) 1 item
  43. HB Industries 14 items
  44. HERA ARMS 13 items
  45. Heresy Design 2 items
  46. Hiperfire 8 items
  47. HUXWRX 1 item
  48. Icarus Precision 2 items
  49. James Madison Tactical (JMT) 2 items
  50. JK Armament 10 items
  51. JL Billet 3 items
  52. JMAC Customs 18 items
  53. JP Enterprises Inc 7 items
  54. KAK Industries 1 item
  55. Kinetic Development Group 2 items
  56. Knight’s Armament Company (KAC) 2 items
  57. KNS Precision 7 items
  58. Kaw Valley Precision 2 items
  59. Kratos Design Group 2 items
  60. Krebs Customs 3 items
  61. Lantac 3 items
  62. LUTH-AR 2 items
  63. Mad Pig 4 items
  64. Magpul Industries 53 items
  65. Maxim Defense 2 items
  66. Midwest Industries 3 items
  67. Mission First Tactical 3 items
  68. Multitasker Tools 1 item
  69. NEMO Arms 3 items
  70. Neverwear Springs 1 item
  71. Next Level Armament 12 items
  72. NIGHT FISION 1 item
  73. Noveske 7 items
  74. Odin Works 1 item
  75. Patriot Ordnance Factory (POF) 2 items
  76. Precision Armament 3 items
  77. Primary Weapon Systems 9 items
  78. Q, LLC 6 items
  79. R&D Precision 1 item
  80. Radian Weapons 8 items
  81. Rainier Arms, LLC 26 items
  82. Rainier Industries 14 items
  83. Rehv Arms 2 items
  84. Reptilia Corp 4 items
  85. Riflespeed 1 item
  86. Rise Armament 5 items
  87. SB Tactical 5 items
  88. Seekins Precision 1 item
  89. Sharps Bros 1 item
  90. Shooting Innovations 2 items
  91. Sig Sauer 1 item
  92. Silencerco 6 items
  93. Sionics Weapon Systems 1 item
  94. Sons of Liberty Gun Works 5 items
  95. Spinta Precision 1 item
  96. Sprinco (Tactical Springs) 7 items
  97. Stag Arms 1 item
  98. Stern Defense 1 item
  99. Strike Industries 26 items
  100. Superlative Arms 5 items
  101. Tactical Edge Arms 1 item
  102. Tango Down 1 item
  103. Timney Triggers 1 item
  104. Tippmann Arms 1 item
  105. Torrent Suppressors 2 items
  106. TruCalibre 5 items
  107. True North Concepts 7 items
  108. Tyrant Designs 8 items
  109. Underground Tactical 1 item
  110. Unity Tactical 1 item
  111. V Seven Weapon Systems 15 items
  112. VLTOR 8 items
  113. White Label Armory 2 items
  114. WMD Guns 10 items
Model
  1. CZ Bren 1 item
  2. CZ Scorpion 11 items
  3. FNH 509 1 item
  4. Sig MCX 1 item
  5. Sig MPX 1 item
  6. Springfield Hellcat 1 item
Mount
  1. KeyMod 6 items
  2. M-LOK 48 items
  3. Other 1 item
  4. Picatinny 39 items
Option
  1. AK-47/74 8 items
  2. AR-9 2 items
  3. AR-10 16 items
  4. AR-15 69 items
  5. Standard 1 item
  6. 4.720" 2 items
  7. 6.295" 2 items
  8. 7.870" 2 items
  9. 9.445" 2 items
  10. Bull's Eye 1 item
  11. Vertical Lines 1 item
  12. Minimal 1 item
  13. White - Standard Power 1 item
  14. Blue - Enhanced Power 1 item
  15. Red - Extra Power 1 item
  16. Orange - Extra Extra Power 1 item
  17. Yellow - Reduced Power 1 item
  18. White/Red - Intermediate Power 1 item
  19. Green - Rifle Length Standard Power 1 item
  20. Long 1 item
  21. 1.125-28 TPI 3 Lug/Booster Adaptor 1 item
  22. 1.180-24 TPI 3 Lug/Booster Adaptor 1 item
  23. 9mm 1 item
  24. CZ 9 items
  25. FNH 1 item
  26. Heckler & Koch 1 item
  27. Springfield 1 item
  28. Holed 1 item
  29. Profile 1 item
  30. Small Lever 1 item
  31. Green Laser 1 item
  32. Adjustable 5 items
  33. Non-Adjustable 16 items
  34. Dimpled 3 items
  35. Serrated 5 items
Platform
  1. AR-9 1 item
  2. AR-10/LR308 5 items
  3. AR-15 43 items
  4. AK47/74 5 items
  5. CZ 11 items
  6. FNH 1 item
  7. H&K 2 items
  8. Sig Sauer 2 items
  9. Springfield 1 item
Product Type
  1. Accessory 5 items
  2. Adapter Plate 2 items
  3. Angled Grip 16 items
  4. AR-10 / LR 308 Charging Handle 2 items
  5. AR-10 Handguard 1 item
  6. AR-15 Assembled Upper Receiver 1 item
  7. AR-15 Barrel 10 items
  8. AR-15 Charging Handle 22 items
  9. AR-15 Complete Lower Receiver 1 item
  10. AR-15 Handguard 3 items
  11. AR-15 Stripped Lower Receiver 2 items
  12. AR-15 Stripped Upper Receiver 6 items
  13. AR-9 Upper Receiver 1 item
  14. Barrel Adapter 2 items
  15. Barrel Nut 1 item
  16. Blast Shield 1 item
  17. Bolt Catch 17 items
  18. Brace 5 items
  19. Buffer 17 items
  20. Buffer Kit 7 items
  21. Buffer Spring 7 items
  22. Buffer Tube 9 items
  23. Cam Pin 5 items
  24. Castle Nut 5 items
  25. Castle Nut / End Plate 5 items
  26. Cable Clip 1 item
  27. Charging Handle 27 items
  28. Cheek Riser 4 items
  29. Compensator 37 items
  30. Crush Washer 3 items
  31. Dust Cover 12 items
  32. End Cap 7 items
  33. End Plate 14 items
  34. Failure Resistant Extractor 2 items
  35. Finger Stop 2 items
  36. Firing Pin 3 items
  37. Flash Hider 34 items
  38. Forearm Accesory 14 items
  39. Forward Assist 7 items
  40. Forward Assist Spring 1 item
  41. Front Sight 1 item
  42. Gas Block 25 items
  43. Gas Rings 3 items
  44. Gas Tube 5 items
  45. Grip Accessory 10 items
  46. Grip Module 1 item
  47. Grip Screw 1 item
  48. Handguard 3 items
  49. Handguard Adaptor 2 items
  50. Handstop 33 items
  51. Key Screw 1 item
  52. Lower Parts Kit 12 items
  53. Magazine 1 item
  54. Magazine Button 2 items
  55. Magazine Catch 9 items
  56. Magazine Release 15 items
  57. Magazine Spring 1 item
  58. Magwell 5 items
  59. Muzzle Brake 25 items
  60. Muzzle Device Accessory 6 items
  61. Parts Kit 7 items
  62. Pistol Grip 47 items
  63. Pistol Part 1 item
  64. Port Door 5 items
  65. Port Door Rod 2 items
  66. Port Door Spring 1 item
  67. Rail Adapter 4 items
  68. Rail Panel 13 items
  69. Rail Section 1 item
  70. Recoil Spring 1 item
  71. Retainer Pin 2 items
  72. Roll Pin 2 items
  73. Safety Selector 30 items
  74. Shim Set 3 items
  75. Sight Post 12 items
  76. Spring 8 items
  77. Stock 31 items
  78. Stock Accessory 10 items
  79. Stock Adapter 17 items
  80. Suppressor Accessory 1 item
  81. Take Down / Pivot Pins 17 items
  82. Trigger 19 items
  83. Trigger / Hammer Pins 2 items
  84. Trigger Guard 14 items
  85. Upper Parts Kit 2 items
  86. Vertical Grip 19 items
  87. Weight 1 item
Rail Length
  1. 4" 1 item
  2. 7" 1 item
  3. 7.3" 1 item
  4. 7.8" 1 item
  5. 9" 1 item
  6. 9.2" 1 item
  7. 10" 6 items
  8. 11.25" 1 item
  9. 12" 8 items
  10. 12.6" 2 items
  11. 13.5" 1 item
  12. 14" 1 item
  13. 15" 2 items
  14. 16.5" 1 item
Size
  1. 3" 1 item
  2. Small 1 item
  3. Medium 4 items
  4. Large 4 items
  5. X-Large 2 items
  6. 6" 1 item
  7. 3 Slot 1 item
  8. 5 Slot 3 items
  9. 9 Slot 11 items
  10. 1/2" 1 item
  11. 5/8" 1 item
Thread Pitch
  1. 1/2x28 (9mm) 20 items
  2. 1/2x28 (.22 cal) 55 items
  3. 1/2x32 4 items
  4. 1/2x36 8 items
  5. 3/4x24 1 item
  6. 5/8x24 (.30 cal) 37 items
  7. M13.5x1 LH 7 items
  8. M14x1 LH 1 item
Threaded
  1. Yes 17 items
Twist Rate
  1. 1:7 2 items
  2. 1:10 7 items
Stock Status
  1. In stock 739 items Remove This Item
  2. Out of stock 8 items
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