Palmetto State Armory, under their Harrington & Richardson brand, has released a particularly neat model of 9mm AR. They talked about doing this "at some point" at SHOT Show 2024, but lo and behold it's here and available on the cusp of SHOT 2025! Specifically, this is the Colt 633, an extra-short version of the Colt 9mm SMG. Originally released in 1985, Colt's 9mm adaptation of the AR/M16 platform was never hugely successful against competitors like the MP5. This particular model, with a 7" barrel, was only produced in very limited numbers originally, with the Department of Energy being the only significant purchaser. Why does the DoE need submachine guns, you might ask? Because they are legally responsible for security for nuclear material transportation and facilities.

This new clone of the 633 form H&R/PSA comes with a stabilizing brace that is designed to very closely resemble the original Colt collapsing stock. It uses the same sort of modified Uzi magazines as the original Colts, and is a very good external reproduction while featuring modern internals that are rathe improved form the 1985 state of the art. The most evident non-original feature is the threaded muzzle, which gives a level of flexibility that I suspect most people will appreciate despite its non-originality.

Disclaimer: PSA sent me this for filming. I paid for the SRB registration.