Dennis from the German airsoft retailer, Sniper Airsoft Supply, checks out the SRU SR BUP P1 Gas Blowback Rifle... "The SRU SR BUP P1 GBB is based on the WE MK16 MOD0, but has all the advantages of the Bullpup design with its shorter overall length, though the inner barrel has the same length. Have fun with the video. If there are any questions, requests or suggestions, just send us an email."