7.62 pdw upper advice pls
- Thread starter Smcx
- Start date
3 gun has some 100 yard shots on rifle, sometimes even more.
Barrel length doesn't matter much for accuracy if you're using an optic. The only real difference is velocity. I'm just wondering if the 7.5" limits this to a toy gun. Does the blast cause problems with shooting sports?
Im not sure how much thats true, being barrel length has no impact on accuracy, im not an expert but Im quite observant and the guns that offer the very best accuracy all have longer heavier barrels, how much rifling the bullet is exposed too will affect trajectory as it will impart more stable spin on the bullet, but there are many other factors as well I understand that.
While a long barrel does not imply high accuracy, my tavor has an 18 inch barrel and the best it does is 1.5 moa. Nonetheless, I think repeated high accuracy implies a longer barrel than 8 inches.
most guns built for 3 gun have 18 inch barrels, varmint ARs have 20 inch barrels, now that could be because a rifle length system has better recoil management and less muzzle displacement between shots and has nothing to do with accuracy, but then why would mk12 ARs offer better accuracy than mk18 ARs?
Could it be just their choice of a longer barrel is just because of their need for higher velocity?
Im not sure.
But im sure expert shooters can comment on this.
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Yeah, it's been proven many times. Barrel length is proportional to velocity (to a point depending on calibre). More velocity = flatter trajectory for longer shots, and smaller holdovers. The flip side is a longer barrel introduces harmonics... I wouldn't try to shoot 1000m with a 7.5". I don't plan on shooting more than 200 so velocity has little effect on my shooting.
At least you know every shot will be recorded by the timer.
I've never run a 7 1/2 in 7.62x39, but I've run a 12 inch with a brake - very bright flash (even on an overcast day it's noticeable, at dusk it's obnoxious) and extremely loud and blasty (is that a word?). The Vz is a light gun, so the weights are comparable to a small AR, and I'd say recoil will affect speed to follow up shots, the Vz jumps noticeably. Accuracy will probably be fine inside 200, unless you want to do head shots inside a scoring ring - that may be an issue. At the end of the day, I'd say the x39 will be more fatiguing to shoot matches with, and probably isn't the best solution for 3 gun type matches for that reason alone.
Exactly,
I've never shot a x39 with a short barrel but I have been at the range when another guy had one and it was insanely loud.
I had a 6.5 inch 223 AR last summer and it was quite loud but a linear comp tamed it down to almost manageable. Accuracy was good at 100 yards (2moa ish) but I never tried it any further than that.
I think it would be usable for 3-gun type activities but I would rather go with a 223 so you can run Beowulf mags. I've read posts from a few guys who had problems with reliability using the 7.62x39 LAR pistol mags, some have no problems but others do, sounds like it's pretty hit and miss if you're going to get one that feeds reliably with more than 5 rounds.
Plus if you watch any 3-gun matches with guys who compete at upper levels and can run anything they want they all have 16-18 inch barrels with mid-length to rifle length gas systems and a large comp to make the rifle as smooth as possible. None of them run short little CQB set-up's. I personally don't have much use for any black rifle with a barrel less than 10 inches, all three of my AR's have 12 inch barrels and my latest upper build which I built for 3-gun has a 16 inch with mid-length gas system.
Any rifle or caliber will work, I think it has more to do with what you practice with than what you're using for the most part but having the right gear will definitely help you shave some seconds if you want to get serious.
