Description
JP .308 One Piece Enhanced Gas Ring JP Enterprises AR10 Mcfarland
After testing numerous minute grind callouts, the final JP Enhanced GasRings spec is the perfect balance of a solid gas seal with a verylow-friction relationship between rings and bolt carrier. Reducing theresistance between these components directly results in an overallincrease in the rifle’s reliability while the rings utilize the cyclingaction itself to scrape the walls of the carrier, helping shed fowlingwith every shot. One JP enhanced ring replaces the 3 standard bolt rings that can misalign on a bolt head. Upgrading with the JP ring will eliminate this potential cause of failure.
The JPEGR-308 utilizes a one-piece designsimilar to the Mcfarland rings. Unlike the Mcfarland rings, though, ourprecision-ground gas rings are engineered to precisely suitDPMS-patterned carrier group components such as our own JPEnhancedBolt™.
AR10 JPEGR308
How It’s Supposed To Work
Upon firing, as thepressure of the gas generated by the burning propellant drives theprojectile down the barrel and past the gas port, a small quantity ofthe gas is bled off through the gas port, gas tube, and bolt carrier keyinto the cylindrical section in the bolt carrier where it expands anddrives the bolt carrier rearward. During the first rearward travel ofthe carrier, the bolt is rotated by the cam pin acted on by the boltcarrier cam slot. This rotation disengages the bolt lugs from the barrelextension lugs and so the bolt is unlocked. The carrier then continuesrearward with the unlocked bolt. At this point, the gas used to drivethe bolt carrier rearward is allowed to bleed out through two holes onthe right of the bolt carrier.
The Problem
In order to install the rings on the bolt, they must be split and thus a”gap” on each ring is unavoidable. The problem arises because thesegaps can become aligned, and cause too much gas to escape too early inthe cycle. This can result in short-stroking and possibly jamming therifle, so manuals and instructors enforce the proper alignment of therings when reassembling the AR-15 rifle.
The Solution
A one-piece gas rings solves the problem of “aligned” gapsby eliminating the gaps. As a one-piece helical ring, you are guaranteedto never have the problem with the gaps.
Replacement
The 3 individual rings can be removed one at a time starting with therearmost ring first. Lift one end of the open ring up and over the edgeof the ring groove (towards the rear of the bolt) and then work theother end over. Repeat this for the remaining two rings, and you shouldbe able to remove them without damage. As a single piece of metal, the JP ring is wound onto the groove on the bolt’s rear. Start oneend over the edge, and then work the remainder of the ring over thatedge; the easiest way to accomplish this is without trying to turn thering itself.
