Just received ammo from a company called Precision one, I bought 250 rounds of bulk ammo and 100 rounds of their Defense ammo. It did not feed and when it did it FTE. This ammo is ****. So just to make sure that is was not the gun, I purchased Sellier and Bellot and it cycled perfectly. I have noticed that these little 42s are very sensitive to certain ammo. I have had no problems with magtech ammo either. I am trying to find some Winchster white box to see how that runs. Please post your results with ammo for you 42 so we can all not have to worry about crap ammo. Thanks.