Welcome to today’s Photo of the Day! With PSA’s recent release of their H&R-branded DOE Colt 633 clone generating buzz, here’s the story behind this unique submachine gun. Originally developed in 1985, the Model 633 was a compact 9mm variant of Colt’s AR-15 platform, featuring a 7-inch barrel and designed specifically for Department of Energy nuclear security teams. The DOE version featured distinctive elements: a folding front sight, custom hand guards reportedly adapted from M231 port-firing weapons, and a sheet metal hand stop to prevent forward grip slippage. Using modified Uzi magazines and simple blowback operation, the gun achieved a manageable 700 rpm rate of fire – notably lower than most contemporary machine pistols. PSA’s reproduction, through their revived H&R brand, maintains historical accuracy with correct markings, period-correct features, and even three-position selector markings (though semi-auto only). While offering modern improvements like a threaded barrel and enhanced bolt hold-open, it preserves the original’s distinctive profile, complete with its characteristic gas deflector and compact format.
“The H&R Retro DOE 9mm Pistol is bringing the 80’s back! Styled after the original Dept of Energy SMG, and while it’s compatible with all Colt style magazines, ASC and Metalform are recommended. This pistol features the H&R “HAR-15″ Pistol brace that keeps your retro build compliant while maintaining the classic aesthetic.”
Photo Credit: PSA
Writer | TheFirearmBlog
Writer | AllOutdoor.com Instagram | sfsgunsmith Old soul, certified gunsmith, published author, avid firearm history learner, and appreciator of old and unique guns.
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