This Adjustable Piston System from Superlative Arms (Superlative Arms part no. SABO-PS-LFD-M750CM) converts a left-hand AR-15 upper from direct impingement to short-stroke piston operation, using a mid-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 mid-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.

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 with lighter-recoiling ammunition.

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.

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

Convert a left-hand AR-15 build to smooth-running piston operation with this Superlative Arms mid-length .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.