I'm planning to use extremely light for caliber copper bullets (65gr), and they love long barrels for that velocity boost.
I already have a 3.1" barrel PM9 and four (magguts upgraded) 6 and 7 round magazines for pocket carry, but would like a long barrel option for IWB carry during the cooler months when I'm wearing heavier clothing.
Does anyone know if you could just purchase a TP9 slide, recoil assembly, etc and a 4" ported or 4.5" threaded barrel and slap it on a PM9 grip?
If not, what is the best option to achieve a PM9 grip (to share magazines) with a long 4" or 4.5" barrel?