They were a sweet thing back in the day!!!!%0 Round mag and easy as pie to turn into full auto!!!Problem was the barrelsdidn't like the heat to much!!!!!!Might have had something to do with the supressour????After waiting 6 months for a Gun license,I rang to find out wear my PTA ( Permit to Aquire ) was and they informed me I have to wait another 28 days for a cooling off period!!!WTF?????? Guess you guy better listen as this will be your future before long Mates!!!!!! To my World