JUST INSTALLED 2-SHOT EXT, AND CHECKING TO SEE IF I DONE IT RIGHT. BECAUSE THIS IS MY 1ST. TACTICAL SHOTGUN. I JUST UNSCREWED MAG CAP ,REMOVED BARREL, SLIPPED OFF OLD ONE AND SLIPPED ON NEW ONE, AND TIGHTENED DOWN MAG CAP.NO SEAL CAP OR SPRING POPPED OUT. ALSO WHEN I LOAD SHELLS IN IT IS VERY STIFF PUSHING THEM IN. IS THIS NORMAL FOR THIS MODEL.OR IS THE SPRING JUST TOO NEW. REASON FOR ASKING IS I HAVE A BERETTA TRAP AUTO MY FIRST AND ONLY OTHER SHOTGUN AND THEY GO IN WITH ALOT LESS FORCE, SO THAT WAS BRINGING ME TO THE QUESTION DID I INSTALL IT RIGHT.