that 700 trigger is adjustable for creep and pull...theres directions online if you look...i never tried it...be sure to test it many many times before you chamber a round..could slam fire. if you dont want it super light i think an Jewel would be overkill. timney prices arent bad...if you wanted an aftermarket trigger..

dont know about magazines...the only large capacity mags ive seen were clear plastic 10rd bannana style mags...but you should beable to atleast find a conversion kit for it to accept mags...