Geissele Defense Pistol GDP MOD1 300 Blackout 8" Bbl Ambidextrous DDC Pistol 08-688S

The Geissele Defense Pistol GDP MOD1 300 Blackout 8" 08-688S is a compact AR-pattern pistol built for shooters who want serious performance in a short-barrel package. This GDP 300 runs an 8-inch cold hammer forged barrel with a 1:7 twist, optimized for both supersonic and subsonic .300 Blackout ammunition — so it's ready for suppressed work or standard loads without needing a different setup for each.

A pistol-length gas system keeps cycling reliable at this barrel length, backed by a Reliability Enhanced BCG for smooth, consistent operation. The Geissele SSA two-stage trigger gives you a crisp, dependable break most factory builds can't match. Fully ambidextrous controls — safety, mag release, everything — mean the pistol runs the same for right- and left-handed shooters.

Up front, the free-float MK16 M-LOK handguard and full-length Picatinny rail keep the platform optics-ready and open to whatever accessories you want to run, without touching the barrel. This Geissele GDP ships with one 30-round magazine and a DDC finish.

Order the Geissele MOD 1 GDP 300 Blackout today and get an 8" pistol built to perform, not just look the part.

Key Features

• 8" cold hammer forged barrel, 1:7 twist — supersonic and subsonic capable
• Pistol-length gas system for reliable short-barrel cycling
• Geissele SSA two-stage trigger
• Reliability Enhanced BCG for smooth cycling
• Fully ambidextrous controls
• Free-float MK16 M-LOK handguard with full-length Picatinny rail
• Ships with one 30-round magazine, DDC finish