had the opportunity to pick up a new colt m4 in .22 lr... since ive got several other black rifles, i figured this would be a good way to shoot cheaper... ive got several differnt brands od .22 ammunition, winchester, aquila, remington... all of them seem to have about a 25% failure rate to fire,... i have a firing pin strike on the rim, but it doesn't go bang... i tried them again and they fire... i've got a colt .22 auto pistol that will eat anything... it fired the 1's the rifle didn't... what can i do to improve the firing pin strike on the m4???... thanks, jim