Mine have been all fun.
There have been some reports on magazine problems but I've got 4 , 25rd mags ( 3 are aftermarket ) with zero probs.
Between these two rifles , I've Got over 10,000 rds thru them .
Surprizingly accurate .
The only issues have been with a few FTF's with the ammo , or , I've overlubed and it got all gummed up with the blowback residue , but after a few hundred rds.
I suggest cleaning the packing oil off the bolt /chamber before shooting the 1st time and use very little lube while shooting.
I've been using Winchester Dynapoint , Federal Champ's and CCI Blazer ammo.
Interesting alternation to the mag follower .