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"They messed up the UMP by not making it roller delayed" seems to be a common compliant on the internet, but the truth is, the UMP cannot be roller delayed if it wanted to accept multiple calibers, be cheap to manufacture and easy to maintain.

That's where the new SL-UMP comes in! It's actually the Grand Power SP45A3 "Stribog", which also uses UMP mags and can be outfitted to 75% resemble a UMP but with ROLLER DELAYED guts!

So how do they compare? We find out as we shoot the first shots down the pipe!

Video brought to you by @midwayusa

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