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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" 2 items
  5. 5.5" 2 items
  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" 15 items
  13. 18" 13 items
Caliber
  1. .22 Cal 2 items
  2. .223/5.56 12 items
  3. .223 Rem 1 item
  4. .30 Cal 10 items
  5. .308 5 items
  6. .338 1 item
  7. .458 Socom 1 item
  8. 300 Blackout 2 items
  9. 5.56X45 1 item
  10. 5.56 NATO 13 items
  11. 5.56mm 7 items
  12. 6.5 Grendel 1 item
  13. 7.62mm 1 item
  14. 7.62x39 1 item
  15. 7.62x51 3 items
  16. 8.6 Blackout 2 items
  17. 9mm 30 items
Category
  1. Receiver Parts 18 items
  2. Parts & Kits 280 items
  3. Barrels 12 items
  4. Buffer Systems 48 items
  5. Trigger Parts 55 items
  6. Gas Systems 54 items
  7. Muzzle Devices 164 items
  8. Bolt Parts 22 items
  9. Grips 179 items
  10. Charging Handles 69 items
  11. Rifle Handguards 62 items
  12. Stocks & Braces 77 items
  13. MILSPEC Parts 47 items
Color
Configuration
  1. 90 Degree 1 item
  2. AR-10 3 items
  3. AR-15 18 items
  4. Cross 1 item
  5. Curved 1 item
  6. Flaming Pig 1 item
  7. Flat 1 item
  8. Gen 1-3 1 item
  9. Gen 3 1 item
  10. GEN 2 1 item
  11. Ghetto Blaster 1 item
  12. Left 1 item
  13. Left Hand 1 item
  14. M-LOK 9 items
  15. Normal CQR 2 items
  16. Restricted CQR 2 items
  17. Rifle 1 item
  18. Right Hand 1 item
  19. .625 DIA 8 items
  20. .750 DIA 9 items
  21. .800 DIA 2 items
  22. .875 DIA 3 items
  23. .936 DIA 4 items
  24. Large Latch 1 item
  25. Medium Latch 1 item
  26. Small Latch 1 item
Finish
  1. Bead Blast Stainless Steel 1 item
  2. Black 17 items
  3. Black Nitride 1 item
  4. Blue 1 item
  5. Cerakote 1 item
  6. DLC 4 items
  7. FDE 3 items
  8. Gold 1 item
  9. Grey 1 item
  10. Melonite 2 items
  11. NiB-X 4 items
  12. Nickel Boron 3 items
  13. Nitride 13 items
  14. Nitromet 7 items
  15. Phosphate 1 item
  16. Red 4 items
  17. Anodize 29 items
  18. Quench Polish Quench (QPQ) 2 items
Gas Block Diameter
  1. .625" 8 items
  2. .750" 24 items
  3. .875" 6 items
  4. .936" 5 items
Gas System Length
  1. Blowback 9 items
  2. Pistol -1 2 items
  3. Pistol 9 items
  4. Carbine 5 items
  5. Micro 1 item
  6. Mid 17 items
  7. Intermediate 17 items
  8. Patrol 1 item
  9. Rifle 5 items
  10. Rifle +1 2 items
  11. Rifle +2 2 items
Height
  1. Absolute Co-Witness 4 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 21 items
  2. Accu-Tac 2 items
  3. Advanced Armament Company (AAC) 4 items
  4. Aero Precision 15 items
  5. Aeroknox 7 items
  6. Airborne Arms 1 item
  7. ALG Defense 4 items
  8. Andro Corp Industries 4 items
  9. Angstadt Arms 7 items
  10. Apex Tactical Specialties 5 items
  11. Arisaka 6 items
  12. Armaspec 11 items
  13. Arms Republic 8 items
  14. Ascalon Arms 10 items
  15. Brügger & Thomet (B&T) 1 item
  16. B5 Systems 14 items
  17. Ballistic Advantage 5 items
  18. Battle Arms Development 34 items
  19. Black River MFG 1 item
  20. Blitzkrieg Components 15 items
  21. Bootleg 1 item
  22. Bravo Company MFG (BCM) 39 items
  23. Brigand Arms 1 item
  24. Centurion Arms 4 items
  25. Chisel Machining 1 item
  26. Cobalt Kinetics 1 item
  27. Cross Machine Tool (CMT) 8 items
  28. Daniel Defense 3 items
  29. Dead Air Armament 6 items
  30. Die Free Co 2 items
  31. Drew Meyers Defense 8 items
  32. Driven Arms Co. 17 items
  33. Eartune 1 item
  34. Elftmann Tactical 2 items
  35. Emissary Development 7 items
  36. Ergo Grips 8 items
  37. F-1 Firearms 2 items
  38. Faxon Firearms 10 items
  39. Flatline Fiber Co 1 item
  40. Fortis MFG 38 items
  41. Forward Controls Design 74 items
  42. Gear Head Works 2 items
  43. Geissele 9 items
  44. Grey Ghost Precision 1 item
  45. Griffin Armament 21 items
  46. Half Cocked Arms (HCA) 1 item
  47. HB Industries 20 items
  48. HERA ARMS 17 items
  49. Heresy Design 2 items
  50. Hiperfire 11 items
  51. HUXWRX 1 item
  52. Icarus Precision 2 items
  53. James Madison Tactical (JMT) 3 items
  54. JK Armament 13 items
  55. JL Billet 3 items
  56. JMAC Customs 24 items
  57. JP Enterprises Inc 10 items
  58. KAK Industries 1 item
  59. Kinetic Development Group 6 items
  60. Knight’s Armament Company (KAC) 4 items
  61. KNS Precision 11 items
  62. Kalashnikov USA 1 item
  63. Kaw Valley Precision 2 items
  64. Kratos Design Group 3 items
  65. Krebs Customs 7 items
  66. Lantac 6 items
  67. Leitner-Wise 1 item
  68. LUTH-AR 2 items
  69. Mad Pig 6 items
  70. Mag-Pod 1 item
  71. Magpul Industries 68 items
  72. Maxim Defense 2 items
  73. Midwest Industries 5 items
  74. Mission First Tactical 3 items
  75. Multitasker Tools 1 item
  76. NEMO Arms 4 items
  77. Neverwear Springs 1 item
  78. Next Level Armament 18 items
  79. NIGHT FISION 1 item
  80. Noveske 16 items
  81. Obsidian Arms 1 item
  82. Odin Works 1 item
  83. Patriot Ordnance Factory (POF) 5 items
  84. Precision Armament 6 items
  85. Primary Weapon Systems 10 items
  86. Q, LLC 19 items
  87. R&D Precision 1 item
  88. Radian Weapons 9 items
  89. Rainier Arms, LLC 27 items
  90. Rainier Industries 14 items
  91. Rehv Arms 2 items
  92. Reptilia Corp 5 items
  93. Riflespeed 1 item
  94. Rise Armament 7 items
  95. RogueOps 1 item
  96. RS Regulate 1 item
  97. SB Tactical 6 items
  98. Seekins Precision 1 item
  99. Sharps Bros 1 item
  100. Shooting Innovations 2 items
  101. Sig Sauer 2 items
  102. Silencerco 11 items
  103. Sionics Weapon Systems 2 items
  104. SLR Rifleworks 1 item
  105. Sons of Liberty Gun Works 7 items
  106. Spinta Precision 2 items
  107. Sprinco (Tactical Springs) 7 items
  108. Springer Precision 1 item
  109. Stag Arms 2 items
  110. Stern Defense 1 item
  111. Strike Industries 26 items
  112. Superlative Arms 6 items
  113. Surefire 2 items
  114. Tactical Edge Arms 1 item
  115. Tango Down 1 item
  116. Taran Tactical Innovations 2 items
  117. Timney Triggers 1 item
  118. Tippmann Arms 1 item
  119. Torrent Suppressors 2 items
  120. Triggertech 1 item
  121. Troy Industries 1 item
  122. TruCalibre 9 items
  123. True North Concepts 10 items
  124. Tyrant Designs 9 items
  125. Underground Tactical 1 item
  126. Unity Tactical 1 item
  127. V Seven Weapon Systems 41 items
  128. VLTOR 12 items
  129. White Label Armory 2 items
  130. WMD Guns 13 items
Model
  1. CZ Bren 3 items
  2. CZ Scorpion 19 items
  3. FNH 509 1 item
  4. H&K MP5K 1 item
  5. Sig MCX 1 item
  6. Sig MPX 2 items
  7. Springfield Hellcat 1 item
Mount
  1. KeyMod 13 items
  2. M-LOK 80 items
  3. Other 7 items
  4. Picatinny 55 items
Option
  1. AK-47/74 10 items
  2. AR-9 2 items
  3. AR-10 22 items
  4. AR-15 109 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. SRS-C 3.3 oz. 1 item
  21. SRS-H 3.8 oz. 1 item
  22. SRS-H2 4.7 oz. 1 item
  23. SRS-H3 5.6 oz. 1 item
  24. SRS-BB 5.7 oz. 1 item
  25. SRS-9mm 6.4 oz. 1 item
  26. SRS-AR10 5.7 oz. 1 item
  27. Long 1 item
  28. 1.125-28 TPI 3 Lug/Booster Adaptor 1 item
  29. 1.180-24 TPI 3 Lug/Booster Adaptor 1 item
  30. 9mm 1 item
  31. CZ 21 items
  32. FNH 1 item
  33. Heckler & Koch 1 item
  34. Springfield 1 item
  35. Holed 1 item
  36. Profile 1 item
  37. Small Lever 2 items
  38. Large Lever 2 items
  39. Green Laser 2 items
  40. Adjustable 9 items
  41. Non-Adjustable 29 items
  42. Dimpled 3 items
  43. Serrated 5 items
Platform
  1. AR-9 1 item
  2. AR-10/LR308 5 items
  3. AR-15 55 items
  4. AK47/74 6 items
  5. CZ 19 items
  6. FNH 1 item
  7. H&K 4 items
  8. Sig Sauer 3 items
  9. Springfield 1 item
Price
  1. $0.00 - $9.99 84 items
  2. $10.00 - $19.99 136 items
  3. $20.00 - $29.99 131 items
  4. $30.00 - $39.99 138 items
  5. $40.00 - $49.99 110 items
  6. $50.00 - $59.99 102 items
  7. $60.00 - $69.99 78 items
  8. $70.00 - $79.99 99 items
  9. $80.00 - $89.99 98 items
  10. $90.00 and above 102 items
Product Type
  1. 80% Lower 2 items
  2. Accessory 6 items
  3. Adapter Plate 2 items
  4. AK Handguard 1 item
  5. Angled Grip 23 items
  6. Anti Walk Pins 5 items
  7. AR-10 / LR 308 Charging Handle 3 items
  8. AR-10 Handguard 1 item
  9. AR-15 Assembled Upper Receiver 2 items
  10. AR-15 Barrel 12 items
  11. AR-15 Charging Handle 31 items
  12. AR-15 Complete Lower Receiver 1 item
  13. AR-15 Handguard 3 items
  14. AR-15 Stripped Lower Receiver 5 items
  15. AR-15 Stripped Upper Receiver 8 items
  16. AR-9 Upper Receiver 1 item
  17. Barrel Adapter 2 items
  18. Barrel Nut 4 items
  19. Blast Shield 2 items
  20. Bolt 2 items
  21. Bolt Catch 25 items
  22. Brace 6 items
  23. Brace Strap 1 item
  24. Buffer 23 items
  25. Buffer Kit 9 items
  26. Buffer Spring 8 items
  27. Buffer Tube 15 items
  28. Cam Pin 7 items
  29. Castle Nut 5 items
  30. Castle Nut / End Plate 7 items
  31. Cable Clip 1 item
  32. Charging Handle 36 items
  33. Cheek Riser 4 items
  34. Compensator 47 items
  35. Crush Washer 3 items
  36. Dust Cover 14 items
  37. End Cap 9 items
  38. End Plate 16 items
  39. Failure Resistant Extractor 2 items
  40. Finger Stop 2 items
  41. Firing Pin 6 items
  42. Flash Hider 39 items
  43. Forearm Accesory 19 items
  44. Forward Assist 10 items
  45. Forward Assist Spring 1 item
  46. Front Sight 2 items
  47. Gas Block 45 items
  48. Gas Rings 3 items
  49. Gas Tube 6 items
  50. Grip Accessory 11 items
  51. Grip Module 2 items
  52. Grip Screw 1 item
  53. Gunsmithing Tool 1 item
  54. Handguard 6 items
  55. Handguard Adaptor 2 items
  56. Handstop 52 items
  57. Key Screw 1 item
  58. Lower Parts Kit 20 items
  59. Magazine 1 item
  60. Magazine Button 2 items
  61. Magazine Catch 11 items
  62. Magazine Release 23 items
  63. Magazine Spring 1 item
  64. Magwell 7 items
  65. Muzzle Brake 58 items
  66. Muzzle Device Accessory 13 items
  67. Parts Kit 8 items
  68. Patch 1 item
  69. Pistol Grip 59 items
  70. Pistol Part 1 item
  71. Port Door 5 items
  72. Port Door Rod 6 items
  73. Port Door Spring 1 item
  74. Rail Adapter 6 items
  75. Rail Cover 2 items
  76. Rail Panel 15 items
  77. Rail Section 2 items
  78. Recoil Spring 2 items
  79. Retainer Pin 5 items
  80. Roll Pin 2 items
  81. Safety Selector 53 items
  82. Shim Set 5 items
  83. Sight Post 14 items
  84. Sling Mount 2 items
  85. Spring 9 items
  86. Stock 34 items
  87. Stock Accessory 10 items
  88. Stock Adapter 20 items
  89. Suppressor Accessory 1 item
  90. Take Down / Pivot Pins 25 items
  91. Trigger 25 items
  92. Trigger / Hammer Pins 4 items
  93. Trigger Guard 17 items
  94. Trigger Spring 1 item
  95. Upper Parts Kit 3 items
  96. Vertical Grip 35 items
  97. 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" 12 items
  8. 11.25" 1 item
  9. 12" 17 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 3 items
  8. 5 Slot 5 items
  9. 7 Slot 2 items
  10. 9 Slot 24 items
  11. 1/2" 1 item
  12. 5/8" 1 item
Thread Pitch
  1. .578x28 1 item
  2. 1.375-24 1 item
  3. 1/2x28 (9mm) 27 items
  4. 1/2x28 (.22 cal) 80 items
  5. 1/2x32 4 items
  6. 1/2x36 8 items
  7. 3/4x24 1 item
  8. 5/8x24 (.30 cal) 45 items
  9. 5/8x32 1 item
  10. 11/16x24 1 item
  11. M13.5x1 LH 7 items
  12. M14x1 LH 2 items
  13. M18x1.5 2 items
  14. M24x1.5 RH 1 item
Threaded
  1. Yes 24 items
Twist Rate
  1. 1:7 2 items
  2. 1:10 9 items
Stock Status
  1. In stock 755 items
  2. Out of stock 322 items
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