If your planing to up-grade it to with in an inch of its life I’d say don’t bother getting a TM , I’d say get an AGM or a Cyma , both are clones of the TM (so basically EVERY up-grade part on the market will fit!) can only speak from personal experience but I’ve never come across a TM M14 that’s been significantly improved by up-grading it , I know you’ve got the old chestnut of “don’t go messing with the TM pixie dust!” but I do genuinely believe the 14 is the only one you just don’t f**k about with .?