PM7 VS PMR (stock)
PM7 has an on/off ASA, PMR doesn't
PM7 has an aluminium back cap, PMR has a plastic one
PM7 has an aluminium trigger, PMR a plastic trigger
PM7 has a balanced spool-valve bolt design, PMR is unbalanced, and less efficient
PM7 comes with a 12" two-piece Protolite barrel, as good as an Ultralite according to Dusty, honed to 8 micron tolerance instead of 6 (a piece of paper is about 100 microns), PMR has a 12" single-piece Proto barrel, a much worse barrel.
PM7 has metal eyeplates, PMR plastic
PM7 has a knob clamping feedneck, PMR an adjustable one.
PM7 has an aluminium frame, PMR a plastic one.
By plastic I mean composite. A fully upgraded PMR would cost more than a PM7 with an Ultralite Frame, which is the only upgrade you really need.
So, for a max of 70 extra, you get a whole lot more. The cheapest of those upgrades I've mentioned are at least 20 each, some like a barrel or frame are worth about 100-200 alone.
If you really can't spend that much, get a used or new SLG. I think those are better than a PMR as they are more air-efficient and have a stronger composite frame than the PMR. upgrade the trigger and feedneck and barrel and you have a marker thats good enough to go to a tourney with
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