I've already got my dream AR 97% set up as I've always wanted, but as the title says, I'm thinking about picking up a PTR-91 for a proper "heavy-hitter MBR." I've always wanted one - to my long wingspan, the ergonomics are great; the magazines are ridiculously cheap; the ammo is widely available; PTR has had a few years to work out most (if not all) the teething issues, and now makes most (again, if not all) of the parts in-house; even the wide handguards that used to be nearly impossible to find are easy to get. I've fired a FAL, M1A, AR-10, and even a Kel-Tec RFB (which choked on two of the five rounds I put through it and won't be mentioned again), and overall I like the G3 design and feel the best of all of them.
As always, a few questions though:
1) Extended maintenance - what springs and parts wear out often? What should I order to keep it running smoothly for 50,000 rounds - rollers? Main spring? Magazine springs? Is grease the best lube, or should I use oil?
2) Optics - as a MBR and not DMR or other precision role, aside from irons I'd like to run a micro RDS on the permanently-installed Pic rail on the receiver. The most I've been able to find is from years-old discussions involving claw mounts. Would an Aimpoint T1/T2 be mountable for any sort of co-witness? Would they even hold up to the recoil impulse of .308?
3) The lower portion (grip, safety, and trigger pack housing) that these seem to be released with currently look like something TAPCO designed, and I'm not quite convinced I like it. Reviews say that they're functionally fine, but if I want to buy a "Navy" style lower or stamped steel lower, would they presumably be easily interchangeable?
4) Several have talked about using a Heavy Buffer to reduce wear and recoil. Any input, criticisms, or praise for it?
5) Sling. What are my options? Is the HK Claw style really the most recommended option, or can I get creative with IWC QD cups?
Probably more questions later as I think of them. Also feel free to post pictures of your setups, too, since the HK picture thread for this subforum seems to have fizzled out...
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