I bought myself a crossman sierra pro for christmas so I would have something I could shoot in my backyard. I took it out to shoot it and for about the first ten shots it had a crack just like a 22 lr, then it just went away and the only noise you here is from the spring. My question is, is this normal or did something break, it seems to shoot alright and with enough velocity to almost go through a 1/2" of plywood but it seems wierd that the noise level would just drop off like that.
any info I could get would be greatly appreciated
