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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 497-512 of 849

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  1. KNS Precision Bolt Catch Retaining Pin
    KNS Precision Bolt Catch Retaining Pin
    $12.00
    Out of stock
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  2. AeroKnox Orion AR Grip
    AeroKnox Orion AR Grip
    $90.00
    Out of stock
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  3. AeroKnox Hook-Stop MLOK
    AeroKnox Hook-Stop MLOK
    $42.50
    Out of stock
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  4. Angstadt Arms AR-15 0940 Lower Receiver for Glock
    Angstadt Arms AR-15 0940 Lower Receiver for Glock
    $250.00
    Out of stock
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  5. Angstadt Arms AR-15 0940 Receiver Set for Glock
    Angstadt Arms AR-15 0940 Receiver Set for Glock
    $420.00
    Out of stock
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  6. Next Level Armament MPX Ambi Charge Handle and Block Kit
    Next Level Armament MPX Ambi Charge Handle and Block Kit
    $109.00
    Out of stock
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  10. Faxon Firearms PENCIL .308 Win AR-10/LR308 Barrel - 16"
    Faxon Firearms PENCIL .308 Win AR-10/LR308 Barrel - 16"
    $238.28
    Out of stock
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  11. Rainier Arms Ultramatch .308 Billet Upper Receiver MOD 3
    Rainier Arms Ultramatch .308 Billet Upper Receiver MOD 3
    $269.99
    Out of stock
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  12. Lantac N15 Raven Billet Receiver Set
    Lantac N15 Raven Billet Receiver Set
    $458.99
    Out of stock
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  13. Lantac SF15 USR FORGED UPPER & LOWER SET
    Lantac SF15 USR FORGED UPPER & LOWER SET
    $305.98
    Out of stock
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  14. KNS Precision Perma Pin
    KNS Precision Perma Pin
    $10.00
    Out of stock
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Items 497-512 of 849

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Shopping Options
Barrel Length
  1. 5.25" 2 items
  2. 5.5" 7 items
  3. 6" 2 items
  4. 6.5" 1 item
  5. 7" 1 item
  6. 7.25" 1 item
  7. 7.5" 2 items
  8. 7.94" 1 item
  9. 8" 4 items
  10. 8.3" 3 items
  11. 8.5" 5 items
  12. 9" 4 items
  13. 9.5" 1 item
  14. 9.75" 1 item
  15. 10.3" 3 items
  16. 10.5" 13 items
  17. 10.7" 1 item
  18. 11" 1 item
  19. 11.5" 11 items
  20. 11.85" 2 items
  21. 12" 5 items
  22. 12.5" 7 items
  23. 13" 1 item
  24. 13.7" 4 items
  25. 13.9" 1 item
  26. 14.5" 8 items
  27. 16" 45 items
  28. 16.1" 2 items
  29. 16.3" 1 item
  30. 18" 28 items
  31. 20" 13 items
  32. 22" 14 items
  33. 24" 1 item
Barrel Profile
  1. Dissipator 2 items
  2. DMR 2 items
  3. MK12 SPR 7 items
  4. Non-fluted 1 item
Caliber
  1. .22 ARC 4 items
  2. .223/5.56 6 items
  3. .223 Wylde 17 items
  4. .30-30 1 item
  5. .30 Cal 4 items
  6. .308 5 items
  7. .308 Win 14 items
  8. .338 1 item
  9. .38/.357 Magnum 1 item
  10. .45 ACP 1 item
  11. .458 Socom 2 items
  12. 300 Blackout 29 items
  13. 5.56X45 5 items
  14. 5.56 NATO 77 items
  15. 5.56mm 2 items
  16. 6mm ARC 9 items
  17. 6.5 Creedmoor 7 items
  18. 6.5 Grendel 4 items
  19. 6MM Creedmoor 11 items
  20. 7.62mm 4 items
  21. 7.62x39 4 items
  22. 7.62x51 3 items
  23. 8.6 Blackout 7 items
  24. 9mm 26 items
Category
  1. Receiver Parts 174 items
  2. Parts & Kits 101 items
  3. Barrels 122 items
  4. Buffer Systems 30 items
  5. Trigger Parts 47 items
  6. Gas Systems 25 items
  7. Muzzle Devices 83 items
  8. Bolt Parts 48 items
  9. Grips 49 items
  10. Charging Handles 34 items
  11. Rifle Handguards 81 items
  12. Stocks & Braces 55 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. Carbine 1 item
  4. Curved 3 items
  5. Flat 3 items
  6. Gen 1-3 1 item
  7. GEN 2 1 item
  8. Left 1 item
  9. Left Hand 1 item
  10. M-LOK 5 items
  11. Rifle 1 item
  12. Straight 1 item
  13. .625 DIA 3 items
  14. .750 DIA 5 items
  15. .936 DIA 1 item
Finish
  1. Arid 1 item
  2. Black 6 items
  3. Black Nitride 2 items
  4. Cerakote 7 items
  5. Chrome 1 item
  6. DLC 3 items
  7. FDE 1 item
  8. Melonite 2 items
  9. NiB-X 1 item
  10. Nickel Boron 4 items
  11. Nitride 39 items
  12. Nitromet 1 item
  13. Phosphate 3 items
  14. Polished 13 items
  15. Red 1 item
  16. Satin 27 items
  17. Anodize 26 items
  18. Clear Hard Anodize 1 item
  19. Quench Polish Quench (QPQ) 4 items
  20. Titanium Nitride (TiN) 2 items
Gas Block Diameter
  1. .625" 7 items
  2. .750" 89 items
  3. .875" 11 items
  4. .936" 1 item
Gas System Length
  1. Blowback 10 items
  2. Pistol 14 items
  3. Carbine 23 items
  4. Mid 39 items
  5. Intermediate 10 items
  6. Rifle 23 items
  7. Rifle +1 3 items
  8. Rifle +2 4 items
Height
  1. Absolute Co-Witness 2 items
Inside Diameter
  1. 1.3" 1 item
  2. 1.315" 3 items
  3. 1.34" 2 items
  4. 1.4" 1 item
  5. 1.42" 1 item
  6. 1.45" 1 item
  7. 1.5" 1 item
  8. 1.55" 1 item
Manufacturer
  1. A3 Tactical 11 items
  2. Accu-Tac 1 item
  3. Advanced Armament Company (AAC) 1 item
  4. Aero Precision 53 items
  5. Aeroknox 8 items
  6. ALG Defense 1 item
  7. Angstadt Arms 9 items
  8. Apex Tactical Specialties 1 item
  9. Armaspec 9 items
  10. Arms Republic 1 item
  11. Ascalon Arms 5 items
  12. Brügger & Thomet (B&T) 3 items
  13. B5 Systems 5 items
  14. Ballistic Advantage 29 items
  15. Battle Arms Development 38 items
  16. Blitzkrieg Components 3 items
  17. Bootleg 2 items
  18. Bravo Company MFG (BCM) 34 items
  19. Centurion Arms 3 items
  20. Chisel Machining 2 items
  21. Cross Machine Tool (CMT) 8 items
  22. Daniel Defense 5 items
  23. Dead Air Armament 1 item
  24. Dead Foot Arms LLC 4 items
  25. Drew Meyers Defense 2 items
  26. Driven Arms Co. 1 item
  27. Elftmann Tactical 3 items
  28. Ergo Grips 7 items
  29. F5 MFG 10 items
  30. Faxon Firearms 39 items
  31. Ferfrans 1 item
  32. Flatline Fiber Co 1 item
  33. Fortis MFG 11 items
  34. Forward Controls Design 8 items
  35. Gear Head Works 3 items
  36. Geissele 12 items
  37. Grey Birch MFG 1 item
  38. Griffin Armament 16 items
  39. HB Industries 9 items
  40. HERA ARMS 6 items
  41. Heresy Design 1 item
  42. Hiperfire 14 items
  43. HUXWRX 5 items
  44. Icon Defense 1 item
  45. James Madison Tactical (JMT) 1 item
  46. JK Armament 3 items
  47. JMAC Customs 12 items
  48. JP Enterprises Inc 10 items
  49. Kinetic Development Group 5 items
  50. Knight’s Armament Company (KAC) 15 items
  51. KNS Precision 5 items
  52. Kalashnikov USA 2 items
  53. Kratos Design Group 1 item
  54. Krebs Customs 4 items
  55. KynSHOT 3 items
  56. Lantac 13 items
  57. Law Tactical 2 items
  58. Lee Sporting 4 items
  59. Leitner-Wise 1 item
  60. Lewis Machine & Tool (LMT) 13 items
  61. Mad Pig 2 items
  62. Mag-Pod 1 item
  63. Magpul Industries 18 items
  64. Maxim Defense 7 items
  65. Midwest Industries 20 items
  66. NEMO Arms 4 items
  67. Next Level Armament 10 items
  68. Noveske 30 items
  69. Patriot Ordnance Factory (POF) 1 item
  70. Precision Armament 7 items
  71. Primary Weapon Systems 9 items
  72. Q, LLC 12 items
  73. R&D Precision 1 item
  74. Radian Weapons 7 items
  75. Raidworx 1 item
  76. Rainier Arms, LLC 65 items
  77. Rainier Industries 1 item
  78. Reptilia Corp 5 items
  79. Rise Armament 4 items
  80. RS Regulate 1 item
  81. SB Tactical 4 items
  82. Sharps Bros 7 items
  83. Sig Sauer 7 items
  84. Silencerco 9 items
  85. Sionics Weapon Systems 5 items
  86. SLR Rifleworks 4 items
  87. Sons of Liberty Gun Works 12 items
  88. Spinta Precision 3 items
  89. Springer Precision 1 item
  90. Stag Arms 1 item
  91. Stern Defense 1 item
  92. Strike Industries 2 items
  93. Surefire 5 items
  94. Taran Tactical Innovations 2 items
  95. Timney Triggers 4 items
  96. Triggertech 1 item
  97. Troy Industries 7 items
  98. TruCalibre 4 items
  99. Tyrant Designs 5 items
  100. V Seven Weapon Systems 39 items
  101. VKTR Industries 5 items
  102. VLTOR 6 items
  103. WMD Guns 7 items
  104. WOOX 1 item
Model
  1. CZ Bren 3 items
  2. CZ Scorpion 10 items
  3. FNH Scar 2 items
  4. H&K MP5K 1 item
  5. IWI Galil 1 item
  6. Remington 700 2 items
  7. Sig MCX 5 items
  8. Sig MPX 1 item
Mount
  1. KeyMod 8 items
  2. M-LOK 74 items
  3. Picatinny 25 items
Optic Footprint
  1. Aimpoint Acro 1 item
Option
  1. AK-47/74 4 items
  2. AR-9 7 items
  3. AR-10 23 items
  4. AR-15 119 items
  5. FN 509 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. CZ 13 items
  19. FNH 1 item
  20. Glock 3 items
  21. Heckler & Koch 1 item
  22. Small Lever 1 item
  23. Large Lever 2 items
  24. AKM 1 item
  25. Green Laser 1 item
  26. Adjustable 4 items
  27. Non-Adjustable 14 items
  28. MCS 2 items
  29. Full Size 2 items
  30. IWI Uzi Pro 1 item
Platform
  1. AR-10/LR308 17 items
  2. AR-15 138 items
  3. AK47/74 5 items
  4. CZ 10 items
  5. FNH 2 items
  6. H&K 2 items
  7. IWI 1 item
  8. Remington 2 items
  9. Remington 700 9 items
  10. Ruger 1 item
  11. Ruger Precision Rifle 1 item
  12. Savage Small Shank 10 items
  13. Sig Sauer 8 items
  14. Sig MPX 1 item
  15. Steyr Aug 1 item
Price
  1. $0.00 - $999.99 823 items
  2. $1,000.00 - $1,999.99 24 items
  3. $2,000.00 - $2,999.99 1 item
  4. $4,000.00 and above 1 item
Product Type
  1. 80% Lower 2 items
  2. Accessory 1 item
  3. Adapter Plate 1 item
  4. Angled Grip 4 items
  5. Anti Walk Pins 4 items
  6. AR-10/LR308 Barrel 15 items
  7. AR-10 / LR 308 Charging Handle 4 items
  8. AR-10 Complete Upper Receiver 1 item
  9. AR-10 Partial Upper Receiver 1 item
  10. AR-10 Handguard 5 items
  11. AR-10 Receiver Set 4 items
  12. AR-10 Stripped Lower Receiver 3 items
  13. AR-10 Stripped Upper Receiver 3 items
  14. AR-15 Assembled Upper Receiver 3 items
  15. AR-15 Barrel 84 items
  16. AR-15 Charging Handle 16 items
  17. AR-15 Complete Lower Receiver 22 items
  18. AR-15 Complete Upper Receiver 25 items
  19. AR-15 Partial Upper Receiver 23 items
  20. AR-15 Handguard 29 items
  21. AR-15 Receiver Set 9 items
  22. AR-15 Stripped Lower Receiver 27 items
  23. AR-15 Stripped Upper Receiver 22 items
  24. AR-15 Upper Receiver Group 1 item
  25. AR-9 Lower Receiver 4 items
  26. AR-9 Complete Lower Receiver 1 item
  27. AR-9 Receiver Set 1 item
  28. AR-9 Upper Receiver 2 items
  29. Barrel Nut 3 items
  30. Blast Shield 3 items
  31. Bolt 5 items
  32. Bolt-Action Barrel 21 items
  33. Bolt Carrier Group 36 items
  34. Bolt Catch 7 items
  35. Brace 8 items
  36. Brace Strap 1 item
  37. Buffer 12 items
  38. Buffer Kit 6 items
  39. Buffer Spring 2 items
  40. Buffer Tube 8 items
  41. Builders Kit 1 item
  42. Castle Nut / End Plate 2 items
  43. Charging Handle 12 items
  44. Chassis 4 items
  45. Compensator 12 items
  46. Complete Upper 9 items
  47. Dust Cover 3 items
  48. End Cap 2 items
  49. End Plate 4 items
  50. Firing Pin 2 items
  51. Flash Hider 13 items
  52. Forearm Accesory 6 items
  53. Forward Assist 4 items
  54. Gas Block 21 items
  55. Gas Tube 1 item
  56. Grip Accessory 1 item
  57. Grip Module 1 item
  58. Gunsmithing Tool 1 item
  59. Handguard 27 items
  60. Handgun 1 item
  61. Handstop 12 items
  62. Iron Sight 1 item
  63. Lower Parts Kit 10 items
  64. Lower Receiver 5 items
  65. Magazine Catch 2 items
  66. Magazine Release 8 items
  67. Magwell 3 items
  68. Muzzle Brake 44 items
  69. Muzzle Device Accessory 12 items
  70. Parts Kit 2 items
  71. Patch 1 item
  72. Pistol Grip 16 items
  73. Piston System 2 items
  74. Port Door Rod 4 items
  75. Rail Adapter 5 items
  76. Rail Cover 2 items
  77. Rail Panel 2 items
  78. Rail Section 2 items
  79. Recoil Spring 1 item
  80. Retainer Pin 4 items
  81. Safety Selector 26 items
  82. Scope Mount 1 item
  83. Shim Set 3 items
  84. Sig MPX Barrel 1 item
  85. Sight Post 2 items
  86. Silent Captured Spring 1 item
  87. Sling Mount 1 item
  88. Spring 1 item
  89. Steyr Aug Barrel 1 item
  90. Stock 30 items
  91. Stock Accessory 5 items
  92. Stock Adapter 8 items
  93. Suppressor 1 item
  94. Take Down / Pivot Pins 7 items
  95. Trigger 36 items
  96. Trigger / Hammer Pins 2 items
  97. Trigger Guard 3 items
  98. Trigger Spring 1 item
  99. Upper Parts Kit 1 item
  100. Vertical Grip 11 items
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" 3 items
  8. 6.91" 1 item
  9. 7" 7 items
  10. 7.2" 1 item
  11. 7.25" 1 item
  12. 7.9" 1 item
  13. 8" 2 items
  14. 8.25" 1 item
  15. 9" 2 items
  16. 9.5" 7 items
  17. 9.55" 1 item
  18. 9.6" 2 items
  19. 9.75" 1 item
  20. 10" 11 items
  21. 10.25" 1 item
  22. 10.5" 4 items
  23. 10.7" 1 item
  24. 10.75" 1 item
  25. 10.8" 1 item
  26. 11" 1 item
  27. 11.1" 1 item
  28. 11.5" 4 items
  29. 11.7" 1 item
  30. 12" 10 items
  31. 12.25" 1 item
  32. 12.4" 1 item
  33. 12.5" 3 items
  34. 12.625" 1 item
  35. 13" 5 items
  36. 13.5" 3 items
  37. 13.625" 1 item
  38. 13.7" 5 items
  39. 13.8" 2 items
  40. 14" 1 item
  41. 15" 27 items
  42. 15.3" 1 item
  43. 15.8" 1 item
  44. 16" 1 item
  45. 16.5" 1 item
  46. 17" 1 item
  47. 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 14 items
Thread Pitch
  1. 1.125x28 1 item
  2. 1.375-24 1 item
  3. 1/2x28 (9mm) 15 items
  4. 1/2x28 (.22 cal) 99 items
  5. 1/2x36 3 items
  6. 3/4x24 1 item
  7. 5/8x24 (.30 cal) 78 items
  8. 5/8x32 1 item
  9. 11/16x24 2 items
  10. M14x1 LH 1 item
  11. M18x1.5 3 items
  12. M24x1.5 RH 1 item
Threaded
  1. Yes 28 items
  2. No 2 items
Twist Rate
  1. 1:3 4 items
  2. 1:5 2 items
  3. 1:6 1 item
  4. 1:7 66 items
  5. 1:7.5 14 items
  6. 1:8 30 items
  7. 1:10 26 items
  8. 1:14 1 item
Stock Status
  1. Out of stock 849 items Remove This Item
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