These 5.56/300 BLK Bolt Carrier Groups are phosphate-coated with chrome-lined gas key and bolt channel, full-auto rated, properly staked, and the bolts are matched to the barrel. Their Rosco phosphate bolt carrier groups are designed to meet modern carbine shooters’ requirements. For their phosphate bolt carrier groups, they team up with the best-Microbest-so the end user receives dependable performance every time. They have also incorporated feedback from consumers and military end users to deliver the products you need, not just what they want to sell. These BCGs meet MIL specifications, with a properly staked gas key and a chrome-lined coating for extended durability. They feature shot peened, MP-tested matched bolts with upgraded extractors, designed to lock perfectly with their extensions for extreme accuracy. Built to withstand full-auto firing and tough use from the end user.

This Glock Bloodline barrel is designed to fit Glock 17 pistols, generations 1 through 4. Although this is an easy-to-do, user-friendly swap, they still recommend consulting a local gunsmith if you have any questions about installation. This barrel is rated for use with SAAMI-approved, factory-new ammunition. The Rosco Manufacturing line of barrels for GLOCK is a drop-in, match-grade option that enhances the accuracy and performance of any stock Glock pistol. All Bloodline Glock barrels are made from 416R stainless steel, broached, honed, polished, and then melonited.

This Glock Bloodline barrel is designed for Glock 43 pistols. Although it is a simple, user-friendly swap to accomplish, they still recommend consulting a local gunsmith if you have any questions about installation. This barrel is rated for use with SAAMI-approved, factory-new ammunition. Rosco Manufacturing’s line of barrels for GLOCK is a drop-in, match-grade option that enhances the accuracy and performance of any stock Glock pistol. All Bloodline Glock barrels are made from 416R stainless steel, broached, honed, polished, and then melonited.

This Rosco 10.5″ 300 Blackout barrel was designed for SBR and Pistol use in conjunction with suppressors. The 10.5″ 300 Blackout Rosco barrel was made to be a direct 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-15s, D-BAL (series), or any laser aiming devices comfortably.

Bloodline 10.5″ M4 5.56 NATO: This Rosco 10.5 M4 5.56 NATO Bloodline Barrel is designed to be the perfect addition to any SBR or Pistol build.

This Rosco 11.5″ M4 5.56 NATO Bloodline Barrel is designed to be the perfect addition to any SBR or Pistol build.

This 12.5″ Rosco barrel is designed to bridge the gap between SBR-Pistol and/ or RECCE platforms and delivers amazing precision performance for its compact size. It is the perfect addition for the person attempting to create the ultimate intermediate patrol platform.

This Bloodline Barrel (Mid-Length): 14.5″ M4 5.56 NATO Mid-Length barrel was designed around the USASOC specs for an Improved Upper Receiver Group with a little bit of the Rosco touch as well. The longer gas system allows for a smoother gas curve which leads to managed dwell times. This combo creates a great balance of speed and performance

This Rosco 14.5″ M4 5.56 NATO Bloodline Barrel was built around the M4 platform and is designed to be the next evolutionary step in the series. This barrel is perfectly suited for next patrol or duty carbine build.

This 16″ M4 5.56 NATO Bloodline Barrel Mid-Length barrel was designed around the USASOC specs for an Improved Upper Receiver Group with a little bit of the Rosco touch as well. The longer gas system allows for a smoother gas curve which leads to managed dwell times. This combo creates a great balance of speed and performance.

The Rosco 300 Blackout barrels were created by using input from SOCOM end users and some of the original creators of the 300 Blackout caliber. Every barrel was designed to optimize the original role for this caliber; to be suppressor friendly and accurate. Twist rates, gas port diameters, and lengths have all been taken into account when we set out to make these.

This Rosco 16″ 5.56 Bloodline Heavy Barrel (HB) was made to cater to end users who need to run their guns hard without any remorse. The heavy contour barrel is well suited for full auto use and abuse.

This Rosco 16″ M4 5.56 NATO Bloodline Barrel is the perfect addition to next build featuring perfect balance, properly sized gas ports in order to optimize performance and reduce premature wear and tear from over gassed barrels.

Great for cloners and purists, these barrels share the same features as the Bloodline 16″ USASOC barrel with 5.56 NATO chamber and mid-length gas but with the classic, time-tested, and proven mil-spec phosphate coating and chrome-lined bore.

The Husky Series gives the take on a SOCOM 10.3. While this barrel isn’t exactly heavy in weight, only a few ounces more than the Bloodline 10.5″ barrel, the Husky profile helps defeat the heat and reduce barrel whip. This barrel is phosphate coated with a chrome lined chamber and bore. Button rifled for that Rosco accurac.

The Husky Series gives the take on a SOCOM 11.5. While this barrel isnt exactly heavy in weight, only a few ounces more than our Bloodline 11.5 barrel, the Husky profile helps defeat the heat and reduce barrel whip. This barrel is phosphate coated with a chrome lined chamber and bore. Button rifled for that Rosco accuracy.

The Husky Series gives the take on a SOCOM 12.5. While this barrel isnt exactly heavy in weight, only a few ounces more than our Bloodline 12.5 barrel, the Husky profile helps defeat the heat and reduce barrel whip. This barrel is phosphate coated with a chrome lined chamber and bore. Button rifled for that Rosco accuracy.

Our Husky Series gives the take on a Modern HBAR. While this barrel isnt exactly heavy in weight, only a few ounces more than our Bloodline 14.5 GVT barrel, the Husky profile helps defeat the heat and reduce barrel whip. This barrel is phosphate coated with a chrome lined chamber and bore. Button rifled for that Rosco accuracy.

The K9 11.5 offers a proprietary patrol length gas system that is smoother than carbine length, more reliable than mid-length. Features an optimized gas port to run reliably suppressed and/or unsuppressed. The K9 continuous taper is the most effective profile to dissipate heat from hard use. With weight shifted to the back of the barrel, modern attachments on the front of the rifle create a perfectly balanced and better handling rifle. Updated target crown carried over from the Purebred series with improved harmonics, fit and finish.

The K9 12.5 offers a proprietary patrol length gas system that is smoother than carbine length, more reliable than mid-length. Features an optimized gas port to run reliably suppressed and/or unsuppressed. The K9 continuous taper is the most effective profile to dissipate heat from hard use. With weight shifted to the back of the barrel, modern attachments on the front of the rifle create a perfectly balanced and better handling rifle. Updated target crown carried over from the Purebred series with improved harmonics, fit and finish.

The K9 13.95″ features a mid-length gas system with an optimized gas port to run reliably suppressed and/or unsuppressed. The K9 continuous taper is the most effective profile to dissipate heat from hard use. With weight shifted to the back of the barrel, modern attachments on the front of the rifle create a perfectly balanced and better handling rifle. Updated target crown carried over from the Purebred series. Features no 90 degree cuts, improved harmonics, fit and finish.

The K9 16″ features an intermediate length gas system with an optimized gas port to run reliably suppressed and/or unsuppressed. The K9 continuous taper is the most effective profile to dissipate heat from hard use. With weight shifted to the back of the barrel, modern attachments on the front of the rifle create a perfectly balanced and better handling rifle. Updated target crown carried over from the Purebred series. Features improved harmonics, fit and finish.

This Rosco 16″ 300 Blackout Barrel is perfectly suited for precision carbine shooters that plan on running only supersonic ammo, or are building a well-balanced hunting platform.