USED – Rosco Manufacturing 10.5″ 300 Blackout Purebred Barrel (1/7 Twist)

Used/Open Box Item: This product is not eligible for return. Click to learn more about used products.



Product Summary

This Rosco Purebred 10.5″ 300 Blackout Barrel was designed for SBR/ Pistol use in conjunction with suppressors. The 10.5” Rosco barrel was made to be a direct precision replacement for any MK 18 platforms that are currently in 5.56 NATO. The 10.5” barrel is also perfect for carbines which require a slightly longer rail in order to run PEQ-15’s, D-BAL (series), or any laser aiming devices comfortably. ALL NFA RULES APPLY!


Technical Information


.300 AAC Blackout

Barrel Twist


Thread Pitch

5/8 x 24



Condition This is a used or open-box item. Products are reviewed and graded by condition.

Used – Good Condition

Catalog Location

California Prop 65 Warning

WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information visit