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raineirarms

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. Rainier Arms MK12 223 Wylde Partial Upper Receiver - 18"
    Rainier Arms MK12 223 Wylde Partial Upper Receiver - 18"
    $1,050.00
    Out of stock
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  3. Geissele MK14 AR-15 Super Modular Rail
    Geissele MK14 AR-15 Super Modular Rail
    Out of stock
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  4. Arms Republic RS AR-15 M-LOK Handguard
    Arms Republic RS AR-15 M-LOK Handguard
    Out of stock
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  6. Aeroknox AX // 15 Handguard M-LOK
    Aeroknox AX // 15 Handguard M-LOK
    Out of stock
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  8. Geissele Super Stabby Bayonet Mount
    Geissele Super Stabby Bayonet Mount
    Out of stock
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  9. Rainier Arms Match 6mm ARC AR-15 Barrel - 22"
    Rainier Arms Match 6mm ARC AR-15 Barrel - 22"
    $260.00
    Out of stock
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  11. Arms Republic 9mm Complete Upper Assembly - 16"
    Arms Republic 9mm Complete Upper Assembly - 16"
    $460.00
    Out of stock
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  14. Midwest Industries MCX Virtus M-LOK Handguard
    Midwest Industries MCX Virtus M-LOK Handguard
    Out of stock
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  15. Angstadt Arms Ultralight M-LOK Handguard
    Angstadt Arms Ultralight M-LOK Handguard
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Items 417-432 of 837

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Barrel Length
  1. 5.25" 1 item
  2. 5.5" 6 items
  3. 6" 1 item
  4. 6.5" 1 item
  5. 7" 1 item
  6. 7.5" 2 items
  7. 7.94" 1 item
  8. 8" 4 items
  9. 8.3" 3 items
  10. 8.5" 6 items
  11. 9" 4 items
  12. 9.5" 1 item
  13. 10.3" 5 items
  14. 10.5" 10 items
  15. 10.7" 1 item
  16. 11" 1 item
  17. 11.5" 8 items
  18. 11.85" 1 item
  19. 12" 6 items
  20. 12.5" 7 items
  21. 13" 1 item
  22. 13.7" 4 items
  23. 13.9" 2 items
  24. 14.5" 9 items
  25. 16" 46 items
  26. 16.1" 1 item
  27. 16.3" 1 item
  28. 18" 22 items
  29. 20" 12 items
  30. 22" 12 items
  31. 24" 1 item
Barrel Profile
  1. Dissipator 2 items
  2. DMR 2 items
  3. MK12 SPR 6 items
Caliber
  1. .22 ARC 3 items
  2. .223/5.56 5 items
  3. .223 Wylde 16 items
  4. .30-30 1 item
  5. .30 Cal 4 items
  6. .308 6 items
  7. .308 Win 12 items
  8. .338 1 item
  9. .38/.357 Magnum 1 item
  10. .45 ACP 1 item
  11. .458 Socom 1 item
  12. 300 Blackout 26 items
  13. 5.56X45 5 items
  14. 5.56 NATO 70 items
  15. 5.56mm 2 items
  16. 6mm ARC 10 items
  17. 6.5 Creedmoor 4 items
  18. 6.5 Grendel 4 items
  19. 6MM Creedmoor 8 items
  20. 7.62mm 4 items
  21. 7.62x39 3 items
  22. 7.62x51 3 items
  23. 8.6 Blackout 6 items
  24. 9mm 28 items
Category
  1. Receiver Parts 176 items
  2. Parts & Kits 89 items
  3. Barrels 106 items
  4. Buffer Systems 38 items
  5. Trigger Parts 53 items
  6. Gas Systems 26 items
  7. Muzzle Devices 75 items
  8. Bolt Parts 50 items
  9. Grips 51 items
  10. Charging Handles 30 items
  11. Rifle Handguards 84 items
  12. Stocks & Braces 58 items
  13. MILSPEC Parts 4 items
Co Witness
  1. Lower 1/3 1 item
Color
Configuration
  1. AR-10 2 items
  2. AR-15 11 items
  3. Curved 8 items
  4. Flat 7 items
  5. Left 1 item
  6. Left Hand 1 item
  7. M-LOK 4 items
  8. Rifle 1 item
  9. Straight 1 item
  10. .625 DIA 3 items
  11. .750 DIA 5 items
  12. .936 DIA 1 item
Finish
  1. Arid 1 item
  2. Black 3 items
  3. Black Nitride 3 items
  4. Cerakote 6 items
  5. Chrome 1 item
  6. DLC 4 items
  7. FDE 1 item
  8. Melonite 1 item
  9. NiB-X 1 item
  10. Nickel Boron 3 items
  11. Nitride 35 items
  12. Nitromet 1 item
  13. Phosphate 2 items
  14. Polished 10 items
  15. Satin 23 items
  16. Anodize 30 items
  17. Quench Polish Quench (QPQ) 4 items
  18. Titanium Nitride (TiN) 2 items
Gas Block Diameter
  1. .625" 7 items
  2. .750" 87 items
  3. .875" 9 items
  4. .936" 1 item
Gas System Length
  1. Blowback 8 items
  2. Pistol 14 items
  3. Carbine 23 items
  4. Mid 46 items
  5. Intermediate 9 items
  6. Rifle 22 items
  7. Rifle +1 4 items
  8. Rifle +2 3 items
Height
  1. Absolute Co-Witness 1 item
Inside Diameter
  1. 1.3" 2 items
  2. 1.315" 3 items
  3. 1.34" 2 items
  4. 1.35" 1 item
  5. 1.4" 1 item
  6. 1.42" 1 item
  7. 1.45" 1 item
  8. 1.5" 1 item
  9. 1.55" 1 item
  10. 1.75" 1 item
Manufacturer
  1. A3 Tactical 12 items
  2. Accu-Tac 1 item
  3. Advanced Armament Company (AAC) 1 item
  4. Aero Precision 54 items
  5. Aeroknox 8 items
  6. Agency Arms 1 item
  7. ALG Defense 1 item
  8. Angstadt Arms 10 items
  9. Apex Tactical Specialties 1 item
  10. Arisaka 3 items
  11. Armaspec 9 items
  12. Arms Republic 6 items
  13. Ascalon Arms 4 items
  14. Brügger & Thomet (B&T) 2 items
  15. B5 Systems 5 items
  16. Ballistic Advantage 30 items
  17. Battle Arms Development 31 items
  18. Blackout Defense 8 items
  19. Blitzkrieg Components 5 items
  20. Bootleg 2 items
  21. Bravo Company MFG (BCM) 34 items
  22. Centurion Arms 6 items
  23. Chisel Machining 1 item
  24. Cross Machine Tool (CMT) 8 items
  25. Daniel Defense 6 items
  26. Dead Air Armament 1 item
  27. Dead Foot Arms LLC 3 items
  28. Drew Meyers Defense 1 item
  29. Elftmann Tactical 1 item
  30. Emissary Development 3 items
  31. Ergo Grips 7 items
  32. F5 MFG 9 items
  33. Faxon Firearms 44 items
  34. Ferfrans 1 item
  35. Flatline Fiber Co 1 item
  36. Fortis MFG 12 items
  37. Forward Controls Design 8 items
  38. FosTecH 2 items
  39. Gear Head Works 2 items
  40. Geissele 24 items
  41. Griffin Armament 11 items
  42. HB Industries 6 items
  43. HERA ARMS 4 items
  44. Heresy Design 1 item
  45. Hiperfire 10 items
  46. HUXWRX 5 items
  47. James Madison Tactical (JMT) 1 item
  48. JK Armament 2 items
  49. JMAC Customs 8 items
  50. JP Enterprises Inc 18 items
  51. Kinetic Development Group 5 items
  52. Knight’s Armament Company (KAC) 12 items
  53. KNS Precision 5 items
  54. Kalashnikov USA 2 items
  55. Krebs Customs 3 items
  56. KynSHOT 1 item
  57. Lantac 13 items
  58. Law Tactical 1 item
  59. Lee Sporting 4 items
  60. Leitner-Wise 1 item
  61. Lewis Machine & Tool (LMT) 13 items
  62. Mad Pig 1 item
  63. Mag-Pod 1 item
  64. Magpul Industries 9 items
  65. Maxim Defense 10 items
  66. Midwest Industries 19 items
  67. NEMO Arms 5 items
  68. Next Level Armament 7 items
  69. Noveske 26 items
  70. Obsidian Arms 1 item
  71. Precision Armament 6 items
  72. Precision Reflex Inc 2 items
  73. Primary Weapon Systems 8 items
  74. Q, LLC 7 items
  75. Radian Weapons 7 items
  76. Raidworx 1 item
  77. Rainier Arms, LLC 57 items
  78. Rehv Arms 1 item
  79. Reptilia Corp 5 items
  80. Rise Armament 5 items
  81. RS Regulate 1 item
  82. SB Tactical 6 items
  83. Sharps Bros 8 items
  84. Sig Sauer 6 items
  85. Silencerco 8 items
  86. Sionics Weapon Systems 5 items
  87. SLR Rifleworks 4 items
  88. Sons of Liberty Gun Works 12 items
  89. Spinta Precision 3 items
  90. Springer Precision 1 item
  91. Stag Arms 1 item
  92. Stern Defense 3 items
  93. Superlative Arms 1 item
  94. Surefire 12 items
  95. Taran Tactical Innovations 2 items
  96. Timney Triggers 5 items
  97. Triggertech 6 items
  98. Troy Industries 7 items
  99. TruCalibre 3 items
  100. True North Concepts 2 items
  101. Tyrant Designs 5 items
  102. V Seven Weapon Systems 32 items
  103. VLTOR 6 items
  104. WMD Guns 6 items
  105. WOOX 1 item
Model
  1. CZ Bren 2 items
  2. CZ Scorpion 6 items
  3. FNH Scar 1 item
  4. H&K G36 1 item
  5. IWI Galil 1 item
  6. Remington 700 4 items
  7. Sig MCX 4 items
  8. Sig MPX 1 item
Mount
  1. KeyMod 9 items
  2. M-LOK 77 items
  3. Picatinny 34 items
Optic Footprint
  1. Aimpoint Acro 1 item
Option
  1. AK-47/74 4 items
  2. AR-9 7 items
  3. AR-10 18 items
  4. AR-15 134 items
  5. H2 Buffer 1 item
  6. SRS-C 3.3 oz. 1 item
  7. SRS-H 3.8 oz. 1 item
  8. SRS-H2 4.7 oz. 1 item
  9. SRS-H3 5.6 oz. 1 item
  10. SRS-BB 5.7 oz. 1 item
  11. SRS-9mm 6.4 oz. 1 item
  12. SRS-AR10 5.7 oz. 1 item
  13. Remington 700 Short Action BDL 1 item
  14. Remington 700 Long Action BDL 1 item
  15. Sauer 100 1 item
  16. WA 1 item
  17. KS 1 item
  18. 9mm 1 item
  19. CZ 11 items
  20. FNH 1 item
  21. Glock 3 items
  22. Heckler & Koch 1 item
  23. Remington 1 item
  24. Sharps Bros 1 item
  25. Small Lever 1 item
  26. Large Lever 2 items
  27. AKM 1 item
  28. Green Laser 1 item
  29. Adjustable 4 items
  30. Non-Adjustable 13 items
  31. MCS 2 items
  32. Full Size 2 items
  33. IWI Uzi Pro 1 item
Platform
  1. AR-9 1 item
  2. AR-10/LR308 16 items
  3. AR-15 137 items
  4. AK47/74 6 items
  5. CZ 6 items
  6. FNH 1 item
  7. IWI 1 item
  8. Remington 4 items
  9. Remington 700 6 items
  10. Ruger Precision Rifle 1 item
  11. Savage Small Shank 7 items
  12. Sig Sauer 6 items
  13. Sig MPX 1 item
  14. Steyr Aug 1 item
Price
  1. $0.00 - $999.99 812 items
  2. $1,000.00 - $1,999.99 24 items
  3. $2,000.00 and above 1 item
Product Type
  1. 80% Lower 2 items
  2. Accessory 1 item
  3. Angled Grip 7 items
  4. Anti Walk Pins 3 items
  5. AR-10/LR308 Barrel 13 items
  6. AR-10 / LR 308 Charging Handle 3 items
  7. AR-10 Complete Upper Receiver 1 item
  8. AR-10 Partial Upper Receiver 1 item
  9. AR-10 Handguard 6 items
  10. AR-10 Receiver Set 3 items
  11. AR-10 Stripped Lower Receiver 2 items
  12. AR-10 Stripped Upper Receiver 3 items
  13. AR-15 Assembled Upper Receiver 3 items
  14. AR-15 Barrel 76 items
  15. AR-15 Charging Handle 15 items
  16. AR-15 Complete Lower Receiver 22 items
  17. AR-15 Complete Upper Receiver 28 items
  18. AR-15 Partial Upper Receiver 24 items
  19. AR-15 Handguard 35 items
  20. AR-15 Receiver Set 10 items
  21. AR-15 Stripped Lower Receiver 28 items
  22. AR-15 Stripped Upper Receiver 22 items
  23. AR-15 Upper Receiver Group 1 item
  24. AR-9 Lower Receiver 4 items
  25. AR-9 Complete Lower Receiver 1 item
  26. AR-9 Receiver Set 1 item
  27. AR-9 Upper Receiver 4 items
  28. Barrel Nut 1 item
  29. Blast Shield 3 items
  30. Bolt 6 items
  31. Bolt-Action Barrel 15 items
  32. Bolt Carrier Group 40 items
  33. Bolt Catch 4 items
  34. Brace 11 items
  35. Brace Strap 1 item
  36. Buffer 12 items
  37. Buffer Kit 8 items
  38. Buffer Spring 7 items
  39. Buffer Tube 10 items
  40. Builders Kit 1 item
  41. Castle Nut / End Plate 2 items
  42. Charging Handle 10 items
  43. Chassis 3 items
  44. Compensator 6 items
  45. Complete Upper 9 items
  46. Dust Cover 2 items
  47. End Cap 2 items
  48. Finger Stop 1 item
  49. Firing Pin 3 items
  50. Flash Hider 17 items
  51. Forearm Accesory 5 items
  52. Forward Assist 4 items
  53. Gas Block 21 items
  54. Gas Tube 2 items
  55. Grip Accessory 2 items
  56. Grip Module 1 item
  57. Gunsmithing Tool 1 item
  58. Handguard 25 items
  59. Handgun 1 item
  60. Handstop 16 items
  61. Iron Sight 1 item
  62. Lower Parts Kit 11 items
  63. Lower Receiver 4 items
  64. Magazine Catch 1 item
  65. Magazine Release 8 items
  66. Magwell 1 item
  67. Muzzle Brake 42 items
  68. Muzzle Device Accessory 8 items
  69. Patch 1 item
  70. Pistol Grip 11 items
  71. Piston System 1 item
  72. Port Door Rod 4 items
  73. Rail Adapter 5 items
  74. Rail Cover 1 item
  75. Rail Panel 3 items
  76. Rail Section 2 items
  77. Recoil Spring 1 item
  78. Retainer Pin 1 item
  79. Safety Selector 25 items
  80. Scope Mount 1 item
  81. Shim Set 2 items
  82. Sig MPX Barrel 1 item
  83. Sight Post 2 items
  84. Sling Mount 2 items
  85. Spring 1 item
  86. Steyr Aug Barrel 1 item
  87. Stock 29 items
  88. Stock Accessory 5 items
  89. Stock Adapter 9 items
  90. Take Down / Pivot Pins 9 items
  91. Trigger 45 items
  92. Trigger / Hammer Pins 1 item
  93. Trigger Guard 2 items
  94. Trigger Spring 1 item
  95. Upper Parts Kit 1 item
  96. Vertical Grip 10 items
  97. Weight 1 item
Rail Length
  1. 3" 1 item
  2. 4" 1 item
  3. 5" 1 item
  4. 5.5" 1 item
  5. 6.0" 2 items
  6. 6.25" 1 item
  7. 6.7" 4 items
  8. 6.91" 1 item
  9. 7" 9 items
  10. 7.25" 1 item
  11. 8" 2 items
  12. 8.25" 1 item
  13. 9" 5 items
  14. 9.25" 1 item
  15. 9.3" 1 item
  16. 9.5" 6 items
  17. 9.55" 1 item
  18. 9.6" 3 items
  19. 9.75" 1 item
  20. 10" 11 items
  21. 10.25" 1 item
  22. 10.5" 6 items
  23. 10.64" 1 item
  24. 10.7" 1 item
  25. 10.75" 1 item
  26. 11" 2 items
  27. 11.5" 3 items
  28. 11.7" 1 item
  29. 12" 11 items
  30. 12.25" 1 item
  31. 12.4" 2 items
  32. 12.5" 5 items
  33. 12.625" 1 item
  34. 13" 7 items
  35. 13.5" 5 items
  36. 13.625" 1 item
  37. 13.7" 5 items
  38. 13.8" 2 items
  39. 14" 2 items
  40. 15" 33 items
  41. 15.3" 2 items
  42. 16" 1 item
  43. 16.5" 1 item
  44. 17" 1 item
  45. 18" 1 item
Size
  1. BACK STRAP:Large 1 item
  2. BACK STRAP:Medium 2 items
  3. 3 Slot 2 items
  4. 5 Slot 2 items
  5. 7 Slot 2 items
  6. 9 Slot 13 items
Thread Pitch
  1. 1.125x28 1 item
  2. 1/2x28 (9mm) 13 items
  3. 1/2x28 (.22 cal) 93 items
  4. 1/2x36 2 items
  5. 3/4x24 1 item
  6. 5/8x24 (.30 cal) 69 items
  7. 5/8x32 1 item
  8. 11/16x24 1 item
  9. M18x1.5 2 items
  10. M24x1.5 RH 1 item
Threaded
  1. Yes 31 items
  2. No 2 items
Twist Rate
  1. 1:3 4 items
  2. 1:5 1 item
  3. 1:6 1 item
  4. 1:7 63 items
  5. 1:7.5 14 items
  6. 1:8 27 items
  7. 1:10 23 items
Stock Status
  1. In stock 2 items
  2. Out of stock 835 items Remove This Item
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