4140-steel AR folding adapter with adjustable hinge tension and left- or right-folding configurations.

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The SA5 Pro is Sylvan Arms' 4140-steel folding adapter for mil-spec AR-15s, many AR-10s, and compatible 9mm AR carriers. It weighs 9.4 ounces, threads into the standard 1-3/16x16 receiver-extension interface, and is sold in left- and right-folding versions.
Sylvan adds an adjustable hinge-tension mechanism to control folding resistance. Fitment is not universal: the company excludes Tippmann .22, LWRC, and Extar EP9 hosts, and some 9mm carriers need their internal weight removed before the carrier extension can be installed.
Add the Sylvan Arms SA5 Pro AR15 Folding Stock Adapter to your build and see how it enhances your platform.