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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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Items 993-1008 of 1069

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  1. Precision Armament - M4-72 Tactical Compensator 5.56mm
    Precision Armament - M4-72 Tactical Compensator 5.56mm
    $85.49
    Out of stock
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  3. Lantac RPS END PLATE & CASTLE NUT
    Lantac RPS END PLATE & CASTLE NUT
    $54.99
    Out of stock
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  4. Reptilia Corp AR-15/SR-25 CQG Pistol Grip - Black
    Reptilia Corp AR-15/SR-25 CQG Pistol Grip - Black
    $19.76
    Out of stock
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  8. Griffin Armament Suppressor Optimized Buffer - Gen 2
    Griffin Armament Suppressor Optimized Buffer - Gen 2
    $52.00
    Out of stock
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  9. TruCalibre AR-15 Enhanced Billet Bolt Catch
    TruCalibre AR-15 Enhanced Billet Bolt Catch
    $36.00
    Out of stock
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  10. TruCalibre AR-15 Enhanced Safety Selector
    TruCalibre AR-15 Enhanced Safety Selector
    $43.00
    Out of stock
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  11. TruCalibre AR-15 Enhanced Mag Button
    TruCalibre AR-15 Enhanced Mag Button
    $8.00
    Out of stock
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  12. TruCalibre AR-15 Enhanced Magazine Button and Catch
    TruCalibre AR-15 Enhanced Magazine Button and Catch
    $17.00
    Out of stock
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  13. RS Regulate Optional Smooth End Cap
    RS Regulate Optional Smooth End Cap
    $44.00
    Out of stock
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  14. Bravo Company MFG (BCM) Extended M3 5.56 Compensator
    Bravo Company MFG (BCM) Extended M3 5.56 Compensator
    $94.95
    Out of stock
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  15. JK Armament 155LT Compensator End Cap - 9MM
    JK Armament 155LT Compensator End Cap - 9MM
    $77.40
    Out of stock
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Items 993-1008 of 1069

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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 281 items
  3. Barrels 12 items
  4. Buffer Systems 48 items
  5. Trigger Parts 55 items
  6. Gas Systems 54 items
  7. Muzzle Devices 161 items
  8. Bolt Parts 22 items
  9. Grips 170 items
  10. Charging Handles 70 items
  11. Rifle Handguards 62 items
  12. Stocks & Braces 78 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 23 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 9 items
  14. Ascalon Arms 10 items
  15. Brügger & Thomet (B&T) 1 item
  16. B5 Systems 13 items
  17. Ballistic Advantage 5 items
  18. Battle Arms Development 34 items
  19. Blackout Defense 1 item
  20. Black River MFG 1 item
  21. Blitzkrieg Components 15 items
  22. Bootleg 1 item
  23. Bravo Company MFG (BCM) 39 items
  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 2 items
  32. Drew Meyers Defense 8 items
  33. Driven Arms Co. 17 items
  34. Eartune 1 item
  35. Elftmann Tactical 2 items
  36. Emissary Development 6 items
  37. Ergo Grips 8 items
  38. F-1 Firearms 2 items
  39. Faxon Firearms 10 items
  40. Flatline Fiber Co 1 item
  41. Fortis MFG 38 items
  42. Forward Controls Design 74 items
  43. Gear Head Works 2 items
  44. Geissele 9 items
  45. Grey Ghost Precision 1 item
  46. Griffin Armament 20 items
  47. Half Cocked Arms (HCA) 1 item
  48. HB Industries 20 items
  49. HERA ARMS 17 items
  50. Heresy Design 2 items
  51. Hiperfire 11 items
  52. HUXWRX 1 item
  53. Icarus Precision 2 items
  54. James Madison Tactical (JMT) 3 items
  55. JK Armament 13 items
  56. JL Billet 3 items
  57. JMAC Customs 24 items
  58. JP Enterprises Inc 10 items
  59. KAK Industries 1 item
  60. Kinetic Development Group 6 items
  61. Knight’s Armament Company (KAC) 4 items
  62. KNS Precision 11 items
  63. Kalashnikov USA 1 item
  64. Kaw Valley Precision 2 items
  65. Kratos Design Group 3 items
  66. Krebs Customs 7 items
  67. Lantac 6 items
  68. Leitner-Wise 1 item
  69. LUTH-AR 2 items
  70. Mad Pig 6 items
  71. Mag-Pod 1 item
  72. Magpul Industries 68 items
  73. Maxim Defense 2 items
  74. Midwest Industries 5 items
  75. Mission First Tactical 3 items
  76. Multitasker Tools 1 item
  77. NEMO Arms 4 items
  78. Neverwear Springs 1 item
  79. Next Level Armament 18 items
  80. NIGHT FISION 1 item
  81. Noveske 16 items
  82. Obsidian Arms 1 item
  83. Odin Works 1 item
  84. Patriot Ordnance Factory (POF) 5 items
  85. Precision Armament 6 items
  86. Primary Weapon Systems 10 items
  87. Q, LLC 12 items
  88. R&D Precision 1 item
  89. Radian Weapons 9 items
  90. Rainier Arms, LLC 27 items
  91. Rainier Industries 14 items
  92. Rehv Arms 2 items
  93. Reptilia Corp 5 items
  94. Riflespeed 1 item
  95. Rise Armament 7 items
  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 27 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 9 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 77 items
  3. Other 1 item
  4. Picatinny 55 items
Option
  1. AK-47/74 10 items
  2. AR-9 2 items
  3. AR-10 22 items
  4. AR-15 108 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 5 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 83 items
  2. $10.00 - $19.99 139 items
  3. $20.00 - $29.99 128 items
  4. $30.00 - $39.99 133 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 96 items
  9. $80.00 - $89.99 96 items
  10. $90.00 and above 104 items
Product Type
  1. 80% Lower 2 items
  2. Accessory 6 items
  3. Adapter Plate 2 items
  4. Angled Grip 22 items
  5. Anti Walk Pins 5 items
  6. AR-10 / LR 308 Charging Handle 3 items
  7. AR-10 Handguard 1 item
  8. AR-15 Assembled Upper Receiver 2 items
  9. AR-15 Barrel 12 items
  10. AR-15 Charging Handle 32 items
  11. AR-15 Complete Lower Receiver 1 item
  12. AR-15 Handguard 3 items
  13. AR-15 Stripped Lower Receiver 4 items
  14. AR-15 Stripped Upper Receiver 8 items
  15. AR-9 Upper Receiver 2 items
  16. Barrel Adapter 2 items
  17. Barrel Nut 4 items
  18. Blast Shield 2 items
  19. Bolt 2 items
  20. Bolt Catch 25 items
  21. Brace 6 items
  22. Brace Strap 1 item
  23. Buffer 23 items
  24. Buffer Kit 9 items
  25. Buffer Spring 8 items
  26. Buffer Tube 15 items
  27. Cam Pin 7 items
  28. Castle Nut 5 items
  29. Castle Nut / End Plate 7 items
  30. Cable Clip 1 item
  31. Charging Handle 36 items
  32. Cheek Riser 4 items
  33. Compensator 45 items
  34. Crush Washer 3 items
  35. Dust Cover 15 items
  36. End Cap 9 items
  37. End Plate 16 items
  38. Failure Resistant Extractor 2 items
  39. Finger Stop 2 items
  40. Firing Pin 6 items
  41. Flash Hider 39 items
  42. Forearm Accesory 19 items
  43. Forward Assist 10 items
  44. Forward Assist Spring 1 item
  45. Front Sight 2 items
  46. Gas Block 45 items
  47. Gas Rings 3 items
  48. Gas Tube 6 items
  49. Grip Accessory 11 items
  50. Grip Module 2 items
  51. Grip Screw 1 item
  52. Gunsmithing Tool 1 item
  53. Handguard 6 items
  54. Handguard Adaptor 2 items
  55. Handstop 47 items
  56. Key Screw 1 item
  57. Lower Parts Kit 20 items
  58. Magazine 1 item
  59. Magazine Button 2 items
  60. Magazine Catch 11 items
  61. Magazine Release 23 items
  62. Magazine Spring 1 item
  63. Magwell 7 items
  64. Muzzle Brake 57 items
  65. Muzzle Device Accessory 13 items
  66. Parts Kit 8 items
  67. Patch 1 item
  68. Pistol Grip 59 items
  69. Pistol Part 1 item
  70. Port Door 5 items
  71. Port Door Rod 6 items
  72. Port Door Spring 1 item
  73. Rail Adapter 6 items
  74. Rail Cover 2 items
  75. Rail Panel 16 items
  76. Rail Section 2 items
  77. Recoil Spring 2 items
  78. Retainer Pin 5 items
  79. Roll Pin 2 items
  80. Safety Selector 53 items
  81. Shim Set 5 items
  82. Sight Post 14 items
  83. Sling Mount 2 items
  84. Spring 9 items
  85. Stock 34 items
  86. Stock Accessory 10 items
  87. Stock Adapter 21 items
  88. Suppressor Accessory 1 item
  89. Take Down / Pivot Pins 25 items
  90. Trigger 25 items
  91. Trigger / Hammer Pins 4 items
  92. Trigger Guard 17 items
  93. Trigger Spring 1 item
  94. Upper Parts Kit 3 items
  95. Vertical Grip 31 items
  96. 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. 1.375-24 1 item
  2. 1/2x28 (9mm) 26 items
  3. 1/2x28 (.22 cal) 80 items
  4. 1/2x32 4 items
  5. 1/2x36 8 items
  6. 3/4x24 1 item
  7. 5/8x24 (.30 cal) 45 items
  8. 5/8x32 1 item
  9. 11/16x24 1 item
  10. M13.5x1 LH 7 items
  11. M14x1 LH 2 items
  12. M18x1.5 2 items
  13. 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 744 items
  2. Out of stock 324 items
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