This Adjustable Piston System from Superlative Arms (Superlative Arms part no. SABO-PS-LFD-R750CM) converts a left-hand AR-15 upper from direct impingement to short-stroke piston operation, using a rifle-length gas system and a .750-inch clamp-on gas block that mounts without pinning or welding. The regulator lets you dial gas flow to match a suppressor, subsonic ammunition, or a specific bolt carrier group.

Key Specifications

• Converts a left-hand AR-15 upper to piston-operated function instead of direct impingement.
• Built around a full rifle-length gas system.
• Uses a .750-inch clamp-on gas block that installs without pinning or welding.
• Includes an adjustable gas regulator for tuning cycling to ammunition or suppressor use.
• Machined specifically for left-hand (LH) AR-15 uppers.

Frequently Asked Questions

Will this fit a standard right-hand AR-15 upper? No, this kit is machined specifically for left-hand AR-15 uppers and won’t correctly align on a standard right-hand receiver.

Do I need to pin or weld the gas block? No, this is a clamp-on gas block that secures with set screws, so no pinning or welding is required.

What does the adjustable regulator do? It lets you dial the amount of gas bled off during each cycle, which helps tune reliability with a suppressor or lighter-recoiling ammunition.

Buy the Superlative Arms LH .750 Clamp-On Piston System

Convert a left-hand AR-15 rifle-length build to smooth-running piston operation with this Superlative Arms .750 clamp-on system. Order it from a Lubbock, Texas gun shop, and our rifle parts selection has more AR-15 gas systems and upper components.