I want a practical weapon to support my team. There have been instances that the other team had multiple snipers that have very accurate and long range DMRs. Our side had more springer snipers that could not keep up.
It there a real performance advantage of a V2.5 over a V2 gear box? If so, I am considering a GG SR25 and convert to a shorter barrel so I can move around easier, and bring fps to 350-380. Keep a scope on it and side iron side or even side mount a small red dot.
This keeps it practical as a dual purpose.
The benefits of a V2.5 are seen at higher fps with heavier bbs, not at the fps you are looking for. And if you are just going to buy another gun like your M4, you might as well just stick with the M4 you already have instead of buying a new gun that will do the same thing, yet use different mags. It seems I forgot about the G&G in my post earlier, it does not have a V2.5, only a mock up version that is basically a normal V2.
I run an m170 spring in my DMR (might be m180) on stock gears and gear box (V3).
1) Stress harden the gears; let it run, and let everything rub together and work itself out before instalation.
2) Get someone else to install it. Seems my thumbs are not strong enough.
3) Use a tapered spring. Is that what they are called? The kind that is a bit weaker at the beginning and end of the cycle.
4) Never-ever dryfire it. I do not want the pistol slapping against the nozzle. I always try to have some amount of back pressure or something.
I have put a bit more than 2,000 rounds through it by now, and the mech and gearbox is not showing any sign of undue stress or severe wear.
My technician claims that the wiggly hopup of the V2 develops extra inaccuracy and causes feeding problems with barrels over the subcarbine or carbine length.
I believe the word you are looking for is nonlinear. It makes the start of the cycle easier on the gears, so there is less force on the pick up tooth. It's easier to compress at first, but then gets harder the longer you press it. Think of a parabolic graph vs a linear graph, that's about how they work.
Dry firing does not harm your gun any more than normally firing your gun. The argument could be made that actually firing bbs is more harmful to the gun than dry firing. BBs cause compression spikes, which will slow down the return rate of the spring and cause air leaks. This could cause PE (VERY unlikely in a DMR, but not too uncommon in a 19 tooth DMR), and inconsistencies in fps/accuracy.
The two piece M4 hop up isn't all that great, and needs a good bit more work than normal to lock down solidly, but a 1 piece hop up is pretty easy to lock down in such a way that you don't have any wobble. Unless it's improperly secured, it should never cause feeding problems, even in a 2 piece design.
