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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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  3. F-1 Firearms Dragon Slay-AR Brake .308/7.62
    F-1 Firearms Dragon Slay-AR Brake .308/7.62
    $91.92
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  10. Fortis MFG AR15/AR10 Billet Magazine Release Button
    Fortis MFG AR15/AR10 Billet Magazine Release Button
    $6.60
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Barrel Length
  1. 3.1" 1 item
  2. 4" 1 item
  3. 4.5" 1 item
  4. 5.25" 1 item
  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. 8.5" 1 item
  12. 10.3" 1 item
  13. 16" 15 items
  14. 18" 13 items
Caliber
  1. .22 Cal 2 items
  2. .223/5.56 10 items
  3. .223 Rem 1 item
  4. .30 Cal 10 items
  5. .308 3 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 28 items
Category
  1. Receiver Parts 15 items
  2. Parts & Kits 278 items
  3. Rifle Barrels 10 items
  4. Buffer Systems 44 items
  5. Trigger Parts 55 items
  6. Gas Systems 54 items
  7. Muzzle Devices 151 items
  8. Bolt Parts 22 items
  9. Grips 166 items
  10. Charging Handles 70 items
  11. Rifle Handguards 61 items
  12. Stocks & Braces 72 items
  13. MILSPEC Parts 46 items
Color
Configuration
  1. 90 Degree 1 item
  2. AR-10 3 items
  3. AR-15 19 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. Rifle 1 item
  16. Right Hand 1 item
  17. .625 DIA 8 items
  18. .750 DIA 9 items
  19. .800 DIA 2 items
  20. .875 DIA 3 items
  21. .936 DIA 4 items
  22. Large Latch 1 item
  23. Medium Latch 1 item
  24. Small Latch 1 item
Finish
  1. Bead Blast Stainless Steel 1 item
  2. Black 16 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 11 items
  14. Nitromet 7 items
  15. Phosphate 1 item
  16. Red 4 items
  17. Anodize 25 items
  18. Quench Polish Quench (QPQ) 3 items
Gas Block Diameter
  1. .625" 8 items
  2. .750" 24 items
  3. .875" 6 items
  4. .936" 5 items
Gas Length
  1. Pistol -1 2 items
  2. Pistol 9 items
  3. Carbine 5 items
  4. Micro 1 item
  5. Mid 17 items
  6. Intermediate 17 items
  7. Patrol 1 item
  8. Rifle 5 items
  9. Rifle +1 2 items
  10. 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. 1.35" 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 16 items
  5. Aeroknox 7 items
  6. Airborne Arms 1 item
  7. ALG Defense 4 items
  8. Andro Corp Industries 4 items
  9. Angstadt Arms 4 items
  10. Apex Tactical Specialties 5 items
  11. Arisaka 6 items
  12. Armaspec 11 items
  13. Arms Republic 10 items
  14. Ascalon Arms 10 items
  15. Brügger & Thomet (B&T) 1 item
  16. B5 Systems 8 items
  17. Ballistic Advantage 5 items
  18. Battle Arms Development 35 items
  19. Blackout Defense 1 item
  20. Black River MFG 1 item
  21. Blitzkrieg Components 15 items
  22. Bravo Company MFG (BCM) 39 items
  23. Breek Arms 1 item
  24. Brigand Arms 1 item
  25. Centurion Arms 4 items
  26. Chisel Machining 1 item
  27. Cobalt Kinetics 1 item
  28. Cross Machine Tool (CMT) 8 items
  29. Daniel Defense 3 items
  30. Dead Air Armament 6 items
  31. Die Free Co 1 item
  32. Drew Meyers Defense 8 items
  33. Driven Arms Co. 14 items
  34. Elftmann Tactical 2 items
  35. Emissary Development 6 items
  36. Ergo Grips 8 items
  37. F-1 Firearms 2 items
  38. Faxon Firearms 9 items
  39. Flatline Fiber Co 1 item
  40. Fortis MFG 38 items
  41. Forward Controls Design 74 items
  42. Gear Head Works 1 item
  43. Geissele 9 items
  44. Grey Ghost Precision 1 item
  45. Griffin Armament 20 items
  46. Half Cocked Arms (HCA) 1 item
  47. HB Industries 19 items
  48. HERA ARMS 12 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 12 items
  55. JL Billet 1 item
  56. JMAC Customs 24 items
  57. JP Enterprises Inc 10 items
  58. Kinetic Development Group 5 items
  59. Knight’s Armament Company (KAC) 4 items
  60. KNS Precision 11 items
  61. Kalashnikov USA 1 item
  62. Kaw Valley Precision 2 items
  63. Kratos Design Group 3 items
  64. Krebs Customs 7 items
  65. Lancer Systems 1 item
  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 2 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 13 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 6 items
  86. Q, LLC 8 items
  87. R&D Precision 1 item
  88. Radian Weapons 9 items
  89. Rainier Arms, LLC 26 items
  90. Rainier Industries 13 items
  91. Rehv Arms 2 items
  92. Reptilia Corp 5 items
  93. Riflespeed 1 item
  94. Rise Armament 4 items
  95. RS Regulate 1 item
  96. SB Tactical 6 items
  97. Seekins Precision 3 items
  98. Sharps Bros 1 item
  99. Shooting Innovations 1 item
  100. Sig Sauer 2 items
  101. Silencerco 11 items
  102. Sionics Weapon Systems 2 items
  103. SLR Rifleworks 1 item
  104. Sons of Liberty Gun Works 8 items
  105. Spinta Precision 2 items
  106. Sprinco (Tactical Springs) 7 items
  107. Springer Precision 1 item
  108. Stag Arms 2 items
  109. Stern Defense 1 item
  110. Strike Industries 34 items
  111. Superlative Arms 6 items
  112. Surefire 2 items
  113. Tactical Edge Arms 1 item
  114. Tango Down 1 item
  115. Taran Tactical Innovations 2 items
  116. Timney Triggers 1 item
  117. Tippmann Arms 1 item
  118. Triggertech 1 item
  119. Troy Industries 1 item
  120. TruCalibre 9 items
  121. True North Concepts 9 items
  122. Tyrant Designs 9 items
  123. Underground Tactical 1 item
  124. Unity Tactical 1 item
  125. V Seven Weapon Systems 41 items
  126. VLTOR 12 items
  127. White Label Armory 2 items
  128. WMD Guns 13 items
Model
  1. CZ Bren 3 items
  2. CZ Scorpion 19 items
  3. FNH 509 1 item
  4. Sig MCX 1 item
  5. Sig MPX 2 items
  6. Springfield Hellcat 1 item
Mount
  1. KeyMod 14 items
  2. M-LOK 75 items
  3. Other 1 item
  4. Picatinny 53 items
Option
  1. AK-47/74 11 items
  2. AR-9 2 items
  3. AR-10 21 items
  4. AR-15 105 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 6 items
  3. AR-15 40 items
  4. AK47/74 4 items
  5. CZ-USA 19 items
  6. FNH 1 item
  7. H&K 3 items
  8. Sig Sauer 3 items
  9. Springfield 1 item
Price
  1. $0.00 - $9.99 76 items
  2. $10.00 - $19.99 137 items
  3. $20.00 - $29.99 125 items
  4. $30.00 - $39.99 137 items
  5. $40.00 - $49.99 103 items
  6. $50.00 - $59.99 100 items
  7. $60.00 - $69.99 78 items
  8. $70.00 - $79.99 90 items
  9. $80.00 - $89.99 89 items
  10. $90.00 and above 102 items
Product Type
  1. 80% Lower 2 items
  2. Accessory 5 items
  3. Adapter Plate 1 item
  4. Angled Grip 24 items
  5. Anti Walk Pins 5 items
  6. AR-10 / LR 308 Charging Handle 4 items
  7. AR-10 Handguard 1 item
  8. AR-15 Assembled Upper Receiver 2 items
  9. AR-15 Charging Handle 31 items
  10. AR-15 Handguard 1 item
  11. AR-15 Stripped Lower Receiver 5 items
  12. AR-15 Stripped Upper Receiver 6 items
  13. AR-9 Upper Receiver 2 items
  14. Barrel 10 items
  15. Barrel Adapter 2 items
  16. Barrel Nut 4 items
  17. Blast Shield 2 items
  18. Bolt 2 items
  19. Bolt Catch 25 items
  20. Brace 6 items
  21. Brace Strap 1 item
  22. Buffer 22 items
  23. Buffer Kit 6 items
  24. Buffer Spring 8 items
  25. Buffer Tube 15 items
  26. Cam Pin 7 items
  27. Castle Nut 5 items
  28. Castle Nut / End Plate 8 items
  29. Cable Clip 1 item
  30. Charging Handle 36 items
  31. Cheek Riser 4 items
  32. Compensator 40 items
  33. Crush Washer 3 items
  34. Dust Cover 15 items
  35. End Cap 9 items
  36. End Plate 14 items
  37. Failure Resistant Extractor 2 items
  38. Finger Stop 2 items
  39. Firing Pin 6 items
  40. Flash Hider 37 items
  41. Forearm Accesory 21 items
  42. Forward Assist 12 items
  43. Forward Assist Spring 1 item
  44. Front Sight 2 items
  45. Gas Block 45 items
  46. Gas Rings 3 items
  47. Gas Tube 6 items
  48. Grip Accessory 10 items
  49. Grip Module 2 items
  50. Grip Screw 1 item
  51. Gunsmithing Tool 1 item
  52. Handguard 6 items
  53. Handguard Adaptor 2 items
  54. Handstop 45 items
  55. Key Screw 1 item
  56. Lower Parts Kit 20 items
  57. Magazine 1 item
  58. Magazine Button 2 items
  59. Magazine Catch 11 items
  60. Magazine Release 23 items
  61. Magazine Spring 1 item
  62. Magwell 5 items
  63. Muzzle Brake 57 items
  64. Muzzle Device Accessory 10 items
  65. Parts Kit 8 items
  66. Patch 1 item
  67. Pistol Grip 58 items
  68. Pistol Part 1 item
  69. Port Door 5 items
  70. Port Door Rod 6 items
  71. Port Door Spring 1 item
  72. Rail Adapter 6 items
  73. Rail Cover 2 items
  74. Rail Panel 17 items
  75. Rail Section 2 items
  76. Recoil Spring 2 items
  77. Retainer Pin 5 items
  78. Roll Pin 2 items
  79. Safety Selector 52 items
  80. Shim Set 5 items
  81. Sight Post 14 items
  82. Sling Mount 2 items
  83. Spring 9 items
  84. Stock 31 items
  85. Stock Accessory 9 items
  86. Stock Adapter 19 items
  87. Suppressor Accessory 1 item
  88. Take Down / Pivot Pins 24 items
  89. Trigger 25 items
  90. Trigger / Hammer Pins 4 items
  91. Trigger Guard 17 items
  92. Trigger Spring 1 item
  93. Upper Parts Kit 3 items
  94. Vertical Grip 29 items
  95. Weight 1 item
Rail Length
  1. 7" 1 item
  2. 7.3" 1 item
  3. 7.8" 1 item
  4. 9.25" 1 item
  5. 10" 12 items
  6. 12" 17 items
  7. 12.6" 2 items
  8. 14" 1 item
  9. 15" 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 6 items
  9. 7 Slot 2 items
  10. 9 Slot 24 items
  11. 1/2" 1 item
  12. 5/8" 1 item
Thread Pitch
  1. 1.375-24 1 item
  2. 1/2x28 93 items
  3. 1/2x32 4 items
  4. 1/2x36 9 items
  5. 3/4x24 1 item
  6. 5/8x24 37 items
  7. 5/8x32 1 item
  8. 11/16x24 1 item
  9. M13.5x1 LH 7 items
  10. M14x1 LH 2 items
  11. M18x1.5 2 items
  12. M24x1.5 RH 1 item
Threaded
  1. Yes 25 items
Twist Rate
  1. 1:10 6 items
Stock Status
  1. In stock 786 items
  2. Out of stock 251 items
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