The Rugged Suppressors Piston in M13.5×1 LH (brand part no. OP004) adapts a Rugged booster assembly to hosts with 13.5×1 left-hand metric threading, common on many European pistols and threaded barrels. Rugged Suppressors machines the piston from heat-treated 17-4 stainless steel with a non-slotted design that creates a full-circumference gas seal — drastically lowering gas blowback for a more comfortable shooting experience. Among Class 3 parts and accessories, this piston favors suppressor owners matching their can to a metric-threaded host.

Key Specifications

• The thread pitch is M13.5×1 LH (left hand).
• The non-slotted design creates a full-circumference gas seal that reduces blowback.
• Machined from 17-4 stainless steel and heat treated for durability.
• Fits Rugged piston-driven booster assemblies.

Frequently Asked Questions

Is this piston an NFA item? No. It is an unregulated mounting accessory — only the suppressor itself is NFA-regulated.

Can I use this piston on a fixed-barrel host? When running a piston system on a fixed-barrel platform such as a carbine or subgun, the spring must be replaced with a Fixed Barrel Spacer per the maker’s guidance.

Buy the Rugged Suppressors Piston

A sealed, blowback-reducing mount for metric-threaded hosts is exactly what this Rugged piston delivers. Order it from our Lubbock, Texas gun shop and it ships fast to your door.