The ROFSTEN was a unique STEN prototype designed at the Royal Ordnance Factory at Fazackerly (ROF), hence the name. The most notable difference is the magazine configuration. The ROFSTEN had a conventional magazine feed and two return spring rods, and a buffer between them. Cocking was achieved through pulling a cocking ring located on the rear end, just above the stock. A large flash eliminator was fixed onto the barrel, and a No.5 bayonet could be fixed. It was made to a very high standard. The ROFSTEN was made in 1944 and ROF wanted to submit it to trials the next year, but there was no funding behind the weapon and it never got beyond prototype stages.

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