I have an older marlin .22,,, my friend in Pa has 25 round banana clips he will give me one if i can pin it to 10 or 15 rounds to be jersey legal, the work would be done at his place before transporting them,

 

They are plastic, is there any way to permanently modify/block them to be jersey legal, or is that still a no-no in jersey, i was thinking of drilling and putting something there then epoxing the holes, but is that ok to do,, also would that mess up the spring in there,, or should i just tell him no thanks

15 round limit is NJ legal.

 

Permanently modifying a hi-cap magazine to 15rds. is perfectly legal.

 

As far as technically doing it, no experience there.

anyone have any ideas on how to modify them

U can take a wooden dowel and cut it and fit it inside you magm this may take a few cuts and test fits. Once u got it in there and it only fits 15 rounds permently secure the base plate. If there is a curve to the mag steam rhe dowel and bend it to fit it. Only other idea is put in 15 rounds figure out where the follower is then remove rounds and put a couple rivets in the side of the mag or blind pin it with a role pin.

^{theyre plastic, i was thinking of measuring for 14 or 15 rounds, drilling a few holes and epoxing dowels across the holes or rivets if i dont break the things,, i'll have him try it on one, see if it works, if not i'll stick with the standar 10 round metal clips i have}