JP Enterprises JPGS-11D2 Adjustable Gas System

The JP Enterprises JPGS-11D2 is the .750 inch bore variant of JP's current-generation D2 Series adjustable gas system. JP pioneered the adjustable gas block on the AR platform, and the D2 Series is their compact, front-adjustable detent block for builders who want precise tuning under slim handguards. The two-piece body splits at the bore, so the block clamps onto an already-installed barrel without disassembly. The front-access valve adjusts with a 5/32 hex key or flat screwdriver, and the external detent mechanism gives repeatable click feedback as the internal screw regulates gas flow.

The D2 line ships in .750 and .875 inch variants under the JPGS-11D2 and JPGS-12D2 labels, with the .750 model being the common AR-15 journal size. JP's documentation lists 416 stainless steel construction, black finish, 52 clicks from fully open to fully closed, and a compact 1.73-ounce weight for the .750 block. The package includes the preassembled two-piece gas block, four 6-32 clamp screws, a T10 Torx key, a gas-tube roll pin, and an optional barrel-pinning roll pin. JP explicitly notes that compatibility with non-JP components is the buyer's responsibility, which is consistent across high-end AR component makers but worth flagging: verify your handguard clearance before ordering.

The JPGS-11D2 is the right choice for precision and competition AR-15s where the shooter tunes for a specific load and wants fine, repeatable adjustment. It is less suited for shooters who swap suppressed and unsuppressed configurations on the same range trip, where the side-adjustable SLR Sentry 7 or finger-adjustable Riflespeed deliver faster retuning. JP also still sells older, simpler .750 inch adjustable blocks for cost-conscious buyers, though without the D2 Series' 52-click front-adjustment layout.