An adjustable gas block does one job. It lets a shooter regulate how much gas cycles the action, which is how competitors reduce felt recoil and keep a rifle tracking flat. The JP D2 is built around that job.
The defining feature is the forward-facing detent adjustment. JP gives it 52 clicks from full open to full closed, which is double the resolution of their earlier detent blocks, so gas can be set in small steps instead of jumping between coarse settings. Because the adjustment faces forward, it can be reached from the muzzle end without pulling a low-profile handguard, and the exterior detent is designed to shed the carbon that tends to gum up a hidden set screw. The two-piece body drops onto barrels that already wear a pin-and-weld muzzle device, where a one-piece block will not fit.
Two things are worth knowing before ordering. It ships as a bare block, so a gas tube is a separate selection and a 5/32 hex key is needed to set it. At 0.875 inches long, it is built short for slim journals like those on Proof barrels, so measure the journal first.
The trade-off is cost. A fixed low-profile block runs about a third the price. For a build being tuned around a compensator or a suppressor, the fine adjustment is what justifies the difference.
$149.95
| Manufacturer | JP Enterprises |
|---|---|
| Model | D2 Series Adjustable Gas Block (JPGS-11D2) |
| Barrel (Gas Journal) Diameter | .750" |
| Material | 416 stainless steel |
| Finish | Black |
| Weight | 1.73 oz (JP spec) |
| Length | 0.875" |
| Height | 1.24" overall, 0.79" over bore |
| Width | 1.17" |
| Adjustment | Forward-facing detent, 52 clicks open to close; 5/32" hex or screwdriver |
| Attachment | 6-32 x 3/8" socket head screws |
| Gas Tube | Not included; length selected separately. Roll pin (5/64 x 5/16) included |
| Patent | 12,292,251 B2 |
| Country of Origin | USA |
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