In the fall of 2014, we began asking our customers what rifle platform they were using our brass for. We were surprised to see the majority were using AR10 / LR308 rifles, and decided it was time to build one of our own to see first hand how our processed Lake City 308 brass performs. As a shooter who enjoys spending several hours at the range with no more than 100 handloads, I tend to favor a bolt action. When setting out to do this build, we also wanted to try and preserve the accuracy more commonly associated with a bolt action.
This will be a two part write-up. In part one we’ll cover the individual components of the build (links included). In part two, we’ll cover how our Lake City 308 brass performed at the range.
The foundation of this LR308 is a DPMS-patterned receiver set, manufactured by Cross Machine and Tool (CMT). We’ve utilized CMT receiver sets for all of our rifle builds used in testing our Lake City 223 and 300 Blackout Brass. Aside from having excellent fit and finish, the nice folks at CMT tap threads for the rear take down pin detent, and bolt catch assembly; CMT receivers are a pleasure to assemble. Utilizing a standard DPMS lower parts kit, we rounded out the lower receiver with a Magpul MOE + grip, an ambidextrous short throw safety selector from Battle Arms Development, and a Geissele Hi-Speed National Match – Designated Marksman Trigger. We also used a Seekins Precision Billet Mag Release Button to get rid of the through hole on the stock button.
Tucked inside the A2 buttstock extension tube is a JP Enterprises Silent Captured Spring, covered up by a Magpul PRS stock. We felt this was the best option for balancing out the overall rifle, and allow ample cheek elevation.
To go along with the Silent Captured Spring we chose the Low Mass Bolt Carrier, Enhanced Bolt, firing and cam pins, 22″ 1:10 twist .308 barrel, and a standard profile compensator, all by JP Enterprises. When ordering these together, JP matches the bolt face to the barrel which is a nice touch. Overall it gives us good peace of mind knowing all of their parts were designed to be used together. For the front end we went with a Centurion Arms CMR 7.62 14″ rail, and a set of their covers. The CMR rail has a smaller diameter than most of it’s competitors which really limited our choices when it came to choosing a gas block. Thankfully, SLR Rifleworks had a very useful schematic of their Sentry 9 which allowed us to verify it’s fit (with .003 clearance) before ordering. The Sentry 9 is a very well made adjustable gas block, with 15 positive click settings. For anyone shooting both subs and supers, this is a handy feature as it allows you to quickly return to a previous setting.
Optics and Mount
In searching for a 1 piece mount, we wanted a built in 20 MOA slant, and integrated bubble level. It came down to a tie between the Aadmount, or a SPHUR. The Aadmount was our first choice, but Jon wasn’t quite ready to roll out his 34mm mount. When the optic arrived, it was painful to not have a means to mount it, so we went with the SPHUR. It was practically double the cost, however it’s a very nice, well built mount and will last us a lifetime. The optic is a Vortex Razor HD Gen II 4.5-27×56 with the EBR2-C Reticle. This will be our first experience with Vortex products, and by the looks, feel, and features, we can tell it’s going to get the job done.
Once the rifle was mocked up, we tore it down, and shipped the receiver set, rail, stock and ejection port cover off to Camo Solutions in Evening Shade, AR for an urban tactical hydro-coating. They do great work but be prepared to get in line and wait! Lastly, we tossed on a Rifles Only FTW sling and an Atlas Bipod w/ ADM mount.
Time to hit the range!
Next up, we’ll go over our load development, and range results.