Just picked up a New Haven model 250C .22 cal. semi-auto rifle with no magazine. The rifle's a little beat up but for $60 what the heck. It looks like the Mossberg equal is the model 350K that also uses the adjustable magazine for shorts, longs and long rifle. Finding the original mag seems futile, I don't plan on shooting anything other than long rifle anyways. I was wondering what other models would fit the 250C, just to fire the long rifle ammo. Thanks in advance.