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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. Price $0.00 - $99.99 Remove This Item
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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. 10.3" 1 item
  12. 16" 7 items
  13. 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 5 items
  9. 6.5 Grendel 1 item
  10. 7.62mm 1 item
  11. 7.62x51 1 item
  12. 9mm 23 items
Category
  1. Receiver Parts 8 items
  2. Parts & Kits 192 items
  3. Barrels 10 items
  4. Buffer Systems 35 items
  5. Trigger Parts 39 items
  6. Gas Systems 33 items
  7. Muzzle Devices 108 items
  8. Bolt Parts 15 items
  9. Grips 126 items
  10. Charging Handles 48 items
  11. Rifle Handguards 40 items
  12. Stocks & Braces 66 items
  13. MILSPEC Parts 42 items
Color
Configuration
  1. 90 Degree 1 item
  2. AR-10 2 items
  3. AR-15 11 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. Rifle 1 item
  12. Right Hand 1 item
  13. .625 DIA 5 items
  14. .750 DIA 5 items
  15. .800 DIA 2 items
  16. .875 DIA 3 items
  17. .936 DIA 3 items
  18. Large Latch 1 item
  19. Medium Latch 1 item
  20. Small Latch 1 item
Finish
  1. Bead Blast Stainless Steel 1 item
  2. Black 12 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 7 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" 15 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
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. ALG Defense 4 items
  6. Andro Corp Industries 4 items
  7. Angstadt Arms 4 items
  8. Apex Tactical Specialties 4 items
  9. Arisaka 6 items
  10. Armaspec 2 items
  11. Arms Republic 5 items
  12. Ascalon Arms 6 items
  13. B5 Systems 11 items
  14. Battle Arms Development 12 items
  15. Black River MFG 1 item
  16. Blitzkrieg Components 14 items
  17. Bravo Company MFG (BCM) 35 items
  18. Brigand Arms 1 item
  19. Centurion Arms 4 items
  20. Chisel Machining 1 item
  21. Cobalt Kinetics 1 item
  22. Cross Machine Tool (CMT) 6 items
  23. Daniel Defense 2 items
  24. Dead Air Armament 4 items
  25. Die Free Co 1 item
  26. Drew Meyers Defense 6 items
  27. Driven Arms Co. 17 items
  28. Eartune 1 item
  29. Elftmann Tactical 1 item
  30. Emissary Development 6 items
  31. Ergo Grips 1 item
  32. F-1 Firearms 2 items
  33. Faxon Firearms 4 items
  34. Fortis MFG 31 items
  35. Forward Controls Design 65 items
  36. Gear Head Works 2 items
  37. Geissele 6 items
  38. Grey Ghost Precision 1 item
  39. Griffin Armament 11 items
  40. Half Cocked Arms (HCA) 1 item
  41. HB Industries 14 items
  42. HERA ARMS 8 items
  43. Heresy Design 2 items
  44. Hiperfire 9 items
  45. HUXWRX 1 item
  46. Icarus Precision 2 items
  47. James Madison Tactical (JMT) 2 items
  48. JK Armament 10 items
  49. JL Billet 1 item
  50. JMAC Customs 19 items
  51. JP Enterprises Inc 9 items
  52. KAK Industries 1 item
  53. Kinetic Development Group 1 item
  54. Knight’s Armament Company (KAC) 2 items
  55. KNS Precision 9 items
  56. Kaw Valley Precision 2 items
  57. Kratos Design Group 3 items
  58. Krebs Customs 3 items
  59. Lantac 3 items
  60. LUTH-AR 2 items
  61. Mad Pig 4 items
  62. Magpul Industries 55 items
  63. Maxim Defense 2 items
  64. Midwest Industries 4 items
  65. Mission First Tactical 3 items
  66. Multitasker Tools 1 item
  67. NEMO Arms 3 items
  68. Neverwear Springs 1 item
  69. Next Level Armament 13 items
  70. NIGHT FISION 1 item
  71. Noveske 7 items
  72. Odin Works 1 item
  73. Patriot Ordnance Factory (POF) 2 items
  74. Precision Armament 3 items
  75. Primary Weapon Systems 9 items
  76. Q, LLC 7 items
  77. R&D Precision 1 item
  78. Radian Weapons 8 items
  79. Rainier Arms, LLC 26 items
  80. Rainier Industries 14 items
  81. Rehv Arms 2 items
  82. Reptilia Corp 4 items
  83. Riflespeed 1 item
  84. Rise Armament 5 items
  85. SB Tactical 5 items
  86. Seekins Precision 1 item
  87. Sharps Bros 1 item
  88. Shooting Innovations 2 items
  89. Sig Sauer 1 item
  90. Silencerco 6 items
  91. Sionics Weapon Systems 1 item
  92. Sons of Liberty Gun Works 5 items
  93. Spinta Precision 1 item
  94. Sprinco (Tactical Springs) 7 items
  95. Stag Arms 1 item
  96. Stern Defense 1 item
  97. Strike Industries 27 items
  98. Superlative Arms 5 items
  99. Tactical Edge Arms 1 item
  100. Tango Down 1 item
  101. Tippmann Arms 1 item
  102. Torrent Suppressors 2 items
  103. Triggertech 1 item
  104. TruCalibre 5 items
  105. True North Concepts 7 items
  106. Tyrant Designs 8 items
  107. Underground Tactical 1 item
  108. Unity Tactical 1 item
  109. V Seven Weapon Systems 15 items
  110. VLTOR 8 items
  111. White Label Armory 2 items
  112. WMD Guns 10 items
Model
  1. CZ Bren 1 item
  2. CZ Scorpion 11 items
  3. FNH 509 1 item
  4. H&K MP5K 1 item
  5. Sig MCX 1 item
  6. Sig MPX 1 item
  7. Springfield Hellcat 1 item
Mount
  1. KeyMod 6 items
  2. M-LOK 49 items
  3. Other 1 item
  4. Picatinny 40 items
Option
  1. AK-47/74 8 items
  2. AR-9 2 items
  3. AR-10 14 items
  4. AR-15 63 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 6 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 3 items
  8. Sig Sauer 2 items
  9. Springfield 1 item
Price
  1. $0.00 - $9.99 63 items
  2. $10.00 - $19.99 103 items
  3. $20.00 - $29.99 99 items
  4. $30.00 - $39.99 89 items
  5. $40.00 - $49.99 79 items
  6. $50.00 - $59.99 73 items
  7. $60.00 - $69.99 52 items
  8. $70.00 - $79.99 56 items
  9. $80.00 - $89.99 67 items
  10. $90.00 and above 72 items
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 Handguard 1 item
  10. AR-15 Stripped Lower Receiver 1 item
  11. AR-15 Stripped Upper Receiver 4 items
  12. AR-9 Upper Receiver 1 item
  13. Barrel Adapter 2 items
  14. Barrel Nut 1 item
  15. Blast Shield 1 item
  16. Bolt 1 item
  17. Bolt Catch 17 items
  18. Brace 5 items
  19. Buffer 18 items
  20. Buffer Kit 7 items
  21. Buffer Spring 7 items
  22. Buffer Tube 10 items
  23. Cam Pin 5 items
  24. Castle Nut 5 items
  25. Castle Nut / End Plate 6 items
  26. Cable Clip 1 item
  27. Charging Handle 28 items
  28. Cheek Riser 4 items
  29. Compensator 35 items
  30. Crush Washer 3 items
  31. Dust Cover 12 items
  32. End Cap 7 items
  33. End Plate 15 items
  34. Failure Resistant Extractor 2 items
  35. Finger Stop 2 items
  36. Firing Pin 3 items
  37. Flash Hider 33 items
  38. Forearm Accesory 14 items
  39. Forward Assist 6 items
  40. Forward Assist Spring 1 item
  41. Front Sight 1 item
  42. Gas Block 26 items
  43. Gas Rings 3 items
  44. Gas Tube 5 items
  45. Grip Accessory 9 items
  46. Grip Module 1 item
  47. Grip Screw 1 item
  48. Handguard 3 items
  49. Handguard Adaptor 2 items
  50. Handstop 35 items
  51. Key Screw 1 item
  52. Lower Parts Kit 13 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 6 items
  59. Muzzle Brake 27 items
  60. Muzzle Device Accessory 7 items
  61. Parts Kit 7 items
  62. Pistol Grip 48 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 3 items
  72. Roll Pin 2 items
  73. Safety Selector 31 items
  74. Shim Set 3 items
  75. Sight Post 13 items
  76. Spring 8 items
  77. Stock 29 items
  78. Stock Accessory 10 items
  79. Stock Adapter 17 items
  80. Suppressor Accessory 1 item
  81. Take Down / Pivot Pins 16 items
  82. Trigger 20 items
  83. Trigger / Hammer Pins 3 items
  84. Trigger Guard 14 items
  85. Upper Parts Kit 1 item
  86. Vertical Grip 19 items
  87. Weight 1 item
Rail Length
  1. 7.3" 1 item
  2. 7.8" 1 item
  3. 10" 6 items
  4. 12" 9 items
  5. 12.6" 2 items
  6. 14" 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) 34 items
  7. M13.5x1 LH 7 items
  8. M14x1 LH 2 items
  9. M18x1.5 1 item
Threaded
  1. Yes 17 items
Twist Rate
  1. 1:7 2 items
  2. 1:10 7 items
Stock Status
  1. In stock 743 items Remove This Item
  2. Out of stock 10 items
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