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Bushmaster ACR Barrel Conversion Kit

Bushmaster ACR 16.5in 5.56mm Barrel Conversion Kit, 91751
Bushmaster ACR 18.5in 5.56mm Barrel Conversion Kit, 91750
Bushmaster ACR 16.5in 5.56mm Barrel Conversion Kit, 91751
1 of 2 images
Bushmaster ACR 16.5in 5.56mm Barrel Conversion Kit, 91751
Bushmaster ACR 18.5in 5.56mm Barrel Conversion Kit, 91750
2 of 2 images
Bushmaster ACR 18.5in 5.56mm Barrel Conversion Kit, 91750

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Questions & Answers
Does it come with mag an bolt

It does not. This is just the quick change barrel cartridge assembly in 5.56NATO. That said, these are great for increasing the capabilities of your rifle.

by Caveman, Verified Owner, April 5, 2020
View All Q&A You Have a Question? Ask!
Color:
Black
Fabric/Material:
Steel
Caliber:
.223 Remington, 5.56x45mm NATO
Barrel Length:
16.5 in
Barrel Profile:
4150 Chrome Moly Steel
Gas System Length:
Rifle Length
Barrel Twist Rate:
1-7
Gun Model:
Bushmaster ACR
Condition:
New

Code: 6C5-ATB-REM16-91751

MPN: 91751

UPC: 604206917515

Product No Longer Available

Product Info for Bushmaster ACR Barrel Conversion Kit

The Bushmaster ACR Barrel Conversions are factory replacement barrel assemblies available in different lengths to meet your needs. These Bushmaster ACR Barrel Conversions are set up with the quick detach barrel system that allows for a simple and convenient barrel change.image

4150 chrome moly vanadium barrels

1-7" twist

Available in 18.5", 16.5", 14.5" and 10.5" bbl.

The Bushmaster ACR Barrel Conversions are drop-in ready and come with the quick change lever, entire piston and op-rod assembly, gas block and comes with an AAC 51 T flash hider. All NFA rules apply.

Features of Bushmaster ACR Barrel Conversion Kit

  • Barrel Length: 18.5"
  • Caliber: 5.56mm
  • Quick detach barrel system
  • 51t AAC flash hider adapter
  • Hammer Forged 4150 Chrome Moly Vanadium
  • Melonite (FNC) Treated

Package Contents:

  • Bushmaster ACR Barrel Conversion Kit

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Federal American Eagle 5.56x45mm NATO 55 Grain Full Metal Jacket Boat Tail Brass Cased Rifle Ammunition
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Doubletap Ammunition Colt National Match .223 Remington, 62 grain, Full Metal Jacket, 50 Rounds Pistol Ammo, 223R62FMJCT
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Freedom Munitions .223 Remington 62 Grain Full Metal Jacket Brass Rifle Ammunition
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First Breach 5.56 NATO 55 Grain Full Metal Jacket Boattail New C220 Brass Cased Rifle Ammo, 1000 Rounds, 50009
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Bushmaster ACR Barrel Conversion Kit Accessories

1–2 / 2
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Ammo Boxes

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Berrys 44661 405 Ammo Box 223 Rem,5.56x45mm NATO 50rd Blue Lid W/Black Bottom
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Berrys 86410 005 Ammo Box 223 Rem,5.56x45mm NATO 100rd Blue Lid W/Black Bottom
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Berrys 11664 005 Ammo Box 223 Rem,5.56x45mm NATO 100rd Smoke Lid W/Black Bottom
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RCBS Impact Resistant Ammo Box .223 Rem/5.56 NATO 86E0BB5F, RC86910
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Bushmaster ACR Barrel Conversion Kit Unavailable & Discontinued Models

List of Unorderable Models

  • Bushmaster ACR 16.5in 5.56mm Barrel Conversion Kit, 91751 , MPN: 91751 , UPC: 604206917515 , Code: 6C5-ATB-REM16-91751
  • Bushmaster ACR 18.5in 5.56mm Barrel Conversion Kit, 91750 , MPN: 91750 , UPC: 604206917508 , Code: 6C5-ATB-REM16-91750
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Last updated 2026-07-31 UTC.