Hatsan Jammin .30 Blitz

Blitz is great. It’s jamming with the larger mag on full auto but not the smaller 17 round. I’ve tried without the suppressor and same deal. I’m wondering if it could be the spring in the barrel that has too much tension. Any advice is for sure appreciated

have you tried running a few patches through the barrel..I read a lot of people posting on the blitz and I have one.. it's only done that one time..🤔I normally clean the barrel with another pellet.. so I got out the cleaning rod and patches and pulled 3-5 very dirty ones through it.. it's the only time I have had a jam and that solved it..
but I also only have the 29 round magazine as mine is 22 caliber..
I'd love to get a adapter to put my Donny FL shogun moderator on it but I haven't been able to find one..
oh the one other time it fails to cycle but it's in both semi and full auto is if I put in too heavy pellets.. it's fine with 14 grain and 18 grain pellets but 25 grain pellets turn it into a bolt action.. so I just don't use them in it because I'm assuming that it might possibly damage it.

Mark