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Questions & Answers
Can I shoot 300 BLK through a 556 barrel? Manufacturer Answer

NO, that would be extremely dangerous.
All barrels are marked for their specific caliber.

by Rosco Customer Service, Manufacturer, April 17, 2025
Can I shoot 223 using this bcg? Expert Answer

Yes, the Rosco Manufacturing 5.56/.300 BLK Bolt Carrier Group can be used with .223, 5.56, and 300 Blackout.

by Ethan, Gear Expert, August 7, 2024
Customer Reviews
Helpful Positive Review
so far so good by G3 Dimitri, Verified Owner, April 19, 2025
Just threw on some lube and let her rip, zero issues with feeding or extracting so far. Paired with a rosco barrel to avoid any headspace issues
1/2 found this helpful
Helpful Positive Review
All Around by CCCitizen, Verified Owner, June 2, 2022
Great value, great reliability and solidly made bcg. Has great build good staking and nice finish. The roscoe logo is a nice touch as well. The bolt fits well with the 223 wylde roscoe barrel i have as well.
2/2 found this helpful
Helpful Positive Review
good price for a step above milspec by neb grendel, Verified Owner, December 31, 2024
The bcg has the quality you would expect from a company like roscoe. This is going in a 10.5 300blk project paired with a roscoe barrel. Head spaces perfectly as it should. Havent had a chance to get to the range but not aticipating any issues.
1/2 found this helpful
Helpful Positive Review
Roscoe BCG by Daniel, March 15, 2022
I have 3 of these now to match their 14.5" Bloodline barrel. I recently bought the Hotsauce pack that has BCG, 12.5" barrel, gas block and gas tube. Like everything I've gotten from Roscoe so far it exceeds their price point by far. Their packaging a...
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6/6 found this helpful
Most Recent Reviews
so far, I’m a fan by Freddie, Verified Owner, August 28, 2025
So far hasn’t failed love the finish. Easy to clean. Oh yes, their packaging is amazing. Big fan of Roscoe.
Most Recent Reviews
clean look by Mario k, Verified Owner, January 4, 2025
Works well and looks good . Added it to my Cmmg, used with frt trigger
Read All 8 Reviews
Color: Black Finish: Melonite Caliber: .300 AAC Blackout , 5.56x45mm NATO Gun Make: AR Platform Gun Model: AR-15 Hand: Right Weight: 0.78 lb

Code: 3FY-BCG-BCRBL-ROS-BCG-001

MPN: Ros-BCG-001

List: $140.00
$139.99

made-in-usa-flag Made in USA

Help support American manufacturing! Marked models of this product have gone through rigorous review and been certified by the manufacturer as Made in the USA.

Product Info for Rosco Manufacturing 5.56/.300 BLK Bolt Carrier Group (BCG)

These 5.56 / 300 BLK Bolt Carrier Group BCG are Melonited, Full-Auto rated, are properly staked, and the bolts are Matched to the barrel. Check your local laws and regulations on ownership guidelines.image

Our Rosco Melonited Bolt Carrier Group BCG are designed to meet the modern-day carbine shooters requirements. We have also balanced input from our consumers and military end users in order to bring you the product you need, not just the one we want to sell you.

All Rosco BCG are to MIL Specification and have a properly staked gas key along with a Melonite coating for extended performance. They also feature a Shot Peened/ MP tested Matched bolt (with upgraded extractor) which is designed to lock up perfectly with our extensions for extreme accuracy. These BCG are made to withstand Full-Auto rated fire and unforgiving use from the end user.

Specifications for Rosco Manufacturing 5.56/.300 BLK Bolt Carrier Group (BCG):

Manufacturer: Rosco Manufacturing
Color: Black
Finish: Melonite
Carrier Material: 8620 Steel
Bolt Material: 9310 Steel
Caliber: 5.56x45mm NATO, .300 AAC Blackout
Gun Make: AR Platform
Gun Model: AR-15
Hand: Right
Weight: 0.78 lb
Country of Origin: USA

Features of Rosco Manufacturing 5.56/.300 BLK Bolt Carrier Group BCG

  • Weight: 0.7875 lbs
  • Dimensions: 1.25 x 1.25 x 8 in
  • 9310 Construction
  • HP/MPI tested
  • Shot peened
  • Melonited
  • Matched to barrels

Package Contents:

  • Rosco Manufacturing 5.56/.300 BLK Bolt Carrier Group

Rosco Manufacturing 5.56/.300 BLK Bolt Carrier Group (BCG) Orderable Models

List of Orderable Models

  • Rosco Manufacturing Bloodline Bolt Carrier Group BCG, 5.56/.300 BLK, Melonited, Black, Ros-BCG-001 , MPN: Ros-BCG-001 , Code: 3FY-BCG-BCRBL-ROS-BCG-001
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