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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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  1. Rainier Arms UltraMatch Billet Upper - MOD 3
    Rainier Arms UltraMatch Billet Upper - MOD 3
    $204.95
    Out of stock
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  2. Hiperfire HIPERTOUCH Reflex, AR15/10 Trigger Assembly
    Hiperfire HIPERTOUCH Reflex, AR15/10 Trigger Assembly
    $213.75
    Out of stock
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  3. Lantac UAR Upper Advanced Receiver inc CP-R360 Cam Pin
    Lantac UAR Upper Advanced Receiver inc CP-R360 Cam Pin
    $229.99
    Out of stock
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  5. LANTAC E-BCG
    LANTAC E-BCG
    $261.99
    Out of stock
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  6. Geissele Super Tricon (Super T) Trigger
    Geissele Super Tricon (Super T) Trigger
    $245.00
    Out of stock
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  7. Battle Arms Development Lightweight Billet Upper Receiver
    Battle Arms Development Lightweight Billet Upper Receiver
    $239.00
    Out of stock
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  8. Hiperfire HIPERTOUCH ECLipse, AR15/10 Trigger Assembly
    Hiperfire HIPERTOUCH ECLipse, AR15/10 Trigger Assembly
    $261.25
    Out of stock
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  9. Rise Armament RA-535 Advanced Performance AR-15 Trigger
    Rise Armament RA-535 Advanced Performance AR-15 Trigger
    $249.99
    Out of stock
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  11. Ribbons Pre Order Noveske NSR GEN 3 AR-15 Handguard - 15"
    Noveske NSR GEN 3 AR-15 Handguard - 15"
    $280.25
    Out of stock
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  12. V Seven Weapon Systems 7075 Billet Enlightened AR15 Upper
    V Seven Weapon Systems 7075 Billet Enlightened AR15 Upper
    $287.12
    Out of stock
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  13. Ribbons Pre Order Noveske NSR GEN 3 AR-15 Handguard - 11.1"
    Noveske NSR GEN 3 AR-15 Handguard - 11.1"
    $261.25
    Out of stock
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  14. Law Tactical Gen 3-M AR Folding Stock Adapter - FDE
    Law Tactical Gen 3-M AR Folding Stock Adapter - FDE
    $269.99
    Out of stock
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  1. Price $200.00 - $299.99 Remove This Item
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Barrel Length
  1. 3.66" 1 item
  2. 4" 2 items
  3. 5" 3 items
  4. 6" 3 items
  5. 7.5" 1 item
  6. 7.75" 1 item
  7. 8" 1 item
  8. 8.5" 3 items
  9. 10.3" 2 items
  10. 10.5" 9 items
  11. 10.7" 2 items
  12. 11.5" 1 item
  13. 12" 4 items
  14. 12.3" 1 item
  15. 12.5" 3 items
  16. 13.7" 2 items
  17. 13.9" 2 items
  18. 14.5" 7 items
  19. 16" 32 items
  20. 16.1" 1 item
  21. 18" 16 items
  22. 20" 6 items
  23. 22" 3 items
Barrel Profile
  1. DMR 2 items
  2. Lightweight 10 items
  3. M16A1 1 item
  4. MK12 SPR 8 items
Caliber
  1. .223/5.56 1 item
  2. .223 Wylde 28 items
  3. .30-30 1 item
  4. .308 3 items
  5. .308 Win 6 items
  6. .458 Socom 2 items
  7. 300 Blackout 8 items
  8. 350 Legend 2 items
  9. 5.56X45 1 item
  10. 5.56 NATO 19 items
  11. 6mm ARC 16 items
  12. 6.5 Creedmoor 2 items
  13. 6.5 Grendel 5 items
  14. 7.62mm 1 item
  15. 8.6 Blackout 3 items
  16. 9mm 15 items
Category
  1. Receiver Parts 54 items
  2. Barrels 102 items
  3. Buffer Systems 6 items
  4. Trigger Parts 66 items
  5. Gas Systems 5 items
  6. Muzzle Devices 3 items
  7. Bolt Parts 25 items
  8. Charging Handles 2 items
  9. Rifle Handguards 66 items
  10. Stocks & Braces 43 items
Co Witness
  1. Lower 1/3 1 item
Color
Configuration
  1. AR-15 4 items
  2. Clamp on Piston Block 1 item
  3. Curved 13 items
  4. Flat 16 items
  5. M-LOK 1 item
  6. Rifle 1 item
  7. Solid Piston Block 1 item
  8. Straight 4 items
Finish
  1. Black 1 item
  2. Cerakote 2 items
  3. Chrome 1 item
  4. FDE 1 item
  5. Nickel Boron 2 items
  6. Nitride 42 items
  7. Polished 5 items
  8. Satin 32 items
  9. Anodize 10 items
Gas Block Diameter
  1. .625" 17 items
  2. .750" 66 items
  3. .875" 9 items
  4. .936" 1 item
Gas System Length
  1. Blowback 14 items
  2. Pistol 19 items
  3. Carbine 18 items
  4. Mid 37 items
  5. Intermediate 1 item
  6. Rifle 26 items
  7. Rifle +2 2 items
Height
  1. Absolute Co-Witness 1 item
Inside Diameter
  1. 1.3" 2 items
  2. 1.31" 1 item
  3. 1.34" 3 items
  4. 1.4" 1 item
  5. 1.55" 1 item
Manufacturer
  1. A3 Tactical 11 items
  2. Aero Precision 13 items
  3. Agency Arms 1 item
  4. American Trigger Company (ATC) 3 items
  5. Andro Corp Industries 3 items
  6. Angstadt Arms 1 item
  7. Ascalon Arms 1 item
  8. Brügger & Thomet (B&T) 1 item
  9. B5 Systems 2 items
  10. Ballistic Advantage 21 items
  11. Battle Arms Development 4 items
  12. Blackout Defense 5 items
  13. Bravo Company MFG (BCM) 11 items
  14. Centurion Arms 6 items
  15. Daniel Defense 1 item
  16. DPM Systems Technologies 2 items
  17. Elftmann Tactical 4 items
  18. F5 MFG 11 items
  19. Faxon Firearms 20 items
  20. Fortis MFG 8 items
  21. Forward Controls Design 8 items
  22. FosTecH 1 item
  23. Geissele 12 items
  24. Grand Power 1 item
  25. Griffin Armament 1 item
  26. HB Industries 1 item
  27. Heresy Design 1 item
  28. Hiperfire 5 items
  29. JL Billet 1 item
  30. JMAC Customs 9 items
  31. JP Enterprises Inc 7 items
  32. Kinetic Development Group 2 items
  33. Knight’s Armament Company (KAC) 4 items
  34. Lantac 4 items
  35. Law Tactical 2 items
  36. Lee Sporting 4 items
  37. Lewis Machine & Tool (LMT) 2 items
  38. Magpul Industries 1 item
  39. Maxim Defense 1 item
  40. Midwest Industries 4 items
  41. Next Level Armament 2 items
  42. Noveske 10 items
  43. Precision Reflex Inc 1 item
  44. Primary Weapon Systems 1 item
  45. Q, LLC 1 item
  46. Radian Weapons 1 item
  47. Rainier Arms, LLC 65 items
  48. Rainier Industries 1 item
  49. Rise Armament 6 items
  50. ROAM Rifles 4 items
  51. RogueOps 1 item
  52. RS Regulate 5 items
  53. Samson Manufacturing Corp. 1 item
  54. SB Tactical 2 items
  55. Sharps Bros 8 items
  56. Sig Sauer 3 items
  57. Silencerco 2 items
  58. SLR Rifleworks 2 items
  59. Sons of Liberty Gun Works 5 items
  60. Superlative Arms 4 items
  61. Surefire 1 item
  62. Tactical Edge Arms 1 item
  63. Timney Triggers 25 items
  64. Triggertech 5 items
  65. Troy Industries 3 items
  66. V Seven Weapon Systems 3 items
  67. VKTR Industries 3 items
  68. VLTOR 2 items
  69. WMD Guns 1 item
Model
  1. CZ Bren 1 item
  2. CZ Scorpion 2 items
  3. FNH Scar 1 item
  4. H&K G36 1 item
  5. IWI Tavor 1 item
  6. Remington 700 5 items
  7. RIA VR80 1 item
  8. Sig MCX 3 items
  9. Sig MPX 3 items
Mount
  1. KeyMod 1 item
  2. M-LOK 40 items
  3. Picatinny 23 items
Option
  1. AR-9 1 item
  2. AR-10 12 items
  3. AR-15 64 items
  4. H2 Buffer 2 items
  5. WA 1 item
  6. KS 1 item
  7. CZ 2 items
  8. Glock 1 item
  9. AKM 1 item
  10. IWI Uzi Pro 1 item
  11. B&T APC 1 item
  12. Dimpled 1 item
Platform
  1. AR-10/LR308 13 items
  2. AR-15 113 items
  3. AK47/74 5 items
  4. CZ 2 items
  5. FNH 1 item
  6. IWI 1 item
  7. Remington 4 items
  8. Remington 700 1 item
  9. Sig Sauer 4 items
Price
  1. $200.00 - $209.99 47 items
  2. $210.00 - $219.99 33 items
  3. $220.00 - $229.99 34 items
  4. $230.00 - $239.99 37 items
  5. $240.00 - $249.99 37 items
  6. $250.00 - $259.99 28 items
  7. $260.00 - $269.99 71 items
  8. $270.00 - $279.99 23 items
  9. $280.00 - $289.99 23 items
  10. $290.00 and above 38 items
Product Type
  1. AR-10/LR308 Barrel 11 items
  2. AR-10 Handguard 3 items
  3. AR-10 Stripped Lower Receiver 3 items
  4. AR-10 Stripped Upper Receiver 2 items
  5. AR-15 Assembled Upper Receiver 1 item
  6. AR-15 Barrel 91 items
  7. AR-15 Complete Lower Receiver 10 items
  8. AR-15 Partial Upper Receiver 1 item
  9. AR-15 Handguard 37 items
  10. AR-15 Receiver Set 3 items
  11. AR-15 Stripped Lower Receiver 15 items
  12. AR-15 Stripped Upper Receiver 8 items
  13. AR-9 Lower Receiver 2 items
  14. AR-9 Complete Lower Receiver 1 item
  15. AR-9 Receiver Set 1 item
  16. AR-9 Upper Receiver 1 item
  17. Blast Shield 1 item
  18. Bolt 3 items
  19. Bolt Carrier Group 19 items
  20. Brace 8 items
  21. Buffer 1 item
  22. Buffer Kit 1 item
  23. Buffer Spring 3 items
  24. Buffer Tube 1 item
  25. Charging Handle 1 item
  26. Chassis 1 item
  27. Gas Block 1 item
  28. Handguard 27 items
  29. Handgun 1 item
  30. Lower Receiver 4 items
  31. Muzzle Brake 1 item
  32. Muzzle Device Accessory 2 items
  33. Piston System 4 items
  34. Rail Adapter 1 item
  35. Scope Mount 1 item
  36. Stock 29 items
  37. Stock Accessory 4 items
  38. Stock Adapter 1 item
  39. Trigger 66 items
Rail Length
  1. 3.25" 1 item
  2. 4.25" 1 item
  3. 4.9" 1 item
  4. 6.0" 2 items
  5. 6.375" 1 item
  6. 6.5" 1 item
  7. 6.7" 2 items
  8. 7" 5 items
  9. 7.2" 2 items
  10. 8" 1 item
  11. 9" 4 items
  12. 9.15" 2 items
  13. 9.3" 1 item
  14. 9.5" 4 items
  15. 9.55" 1 item
  16. 9.59" 1 item
  17. 9.6" 4 items
  18. 10" 8 items
  19. 10.5" 1 item
  20. 10.75" 1 item
  21. 11" 1 item
  22. 11.1" 2 items
  23. 11.5" 3 items
  24. 11.75" 1 item
  25. 11.8" 3 items
  26. 12" 4 items
  27. 12.5" 3 items
  28. 12.55" 1 item
  29. 13" 6 items
  30. 13.5" 5 items
  31. 13.7" 1 item
  32. 13.8" 3 items
  33. 14" 1 item
  34. 15" 17 items
  35. 15.3" 3 items
  36. 16.5" 1 item
  37. 17" 1 item
Size
  1. 9 Slot 2 items
Thread Pitch
  1. 1.375-24 1 item
  2. 1/2x28 (9mm) 13 items
  3. 1/2x28 (.22 cal) 44 items
  4. 5/8x24 (.30 cal) 38 items
  5. 11/16x24 2 items
  6. M18x1.5 3 items
Twist Rate
  1. 1:3 3 items
  2. 1:7 22 items
  3. 1:7.5 7 items
  4. 1:8 45 items
  5. 1:10 22 items
  6. 1:14 2 items
Stock Status
  1. In stock 232 items
  2. Out of stock 139 items
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