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12-12-2018, 11:15pm | #1 | ||||||
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Question about AR15 uppers
I bought a very inexpensive lower from Palmetto ($129). Now I’m looking at uppers and whoa boy, too many choices!
My big question is this. I reload and shoot mostly 55 grain projectiles. I read that the barrel ratio should be 1:9 for light rounds like this. But I can’t seem to find many with that twist rate in a 16” carbine length. Would a 1:7 work just as well? I’m trying to see if I can build one for less than $400 without optics. Seems possible although you ain’t gonna get a decent trigger. What’s the deal with twist ratios? Is it really that important? |
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12-13-2018, 12:39am | #2 | ||||||
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Twist ratio is important. The lighter grain shells use a tighter twist to increase spin in order to make them more accurate. A heavier grain is likely to break apart at higher rate twists, hence the 1:7 and 1:8. Mine (Ruger AR556) is designed to use 62 grain, 1:8 twist. I use 55g a lot and at fifty yards not much difference. At a hundred the 55g will rise a little more due to the lighter weight. I would guess it would be more accurate with a 1:9 on the 55g. Faster spin, more level flight.
I also have one of the .22 Ar's (S&W M&P). Same with it. 1:15 twist on it. The 40g works best versus the 36/38/42. BTW, the Ruger can be bought new for $549. Sometimes a little less. Grabagun ran them a few months ago for $519. That's a complete rifle with flip up sights and a warranty. I've had a bunch of custom builts (actually one with a Palmetto lower) and factory rifles. Sold off all but the Rugers after I bought the first one. |
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12-13-2018, 1:20am | #3 | ||||||
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For practical accuracy, 1:7 twist is fine. The military uses 1:7 for their M4’s and they shoot M193 (55 grain) rounds all day long.
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12-13-2018, 8:53am | #4 | ||||||||
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Now it’s chrome vs. Nitrite |
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12-13-2018, 9:08am | #5 | ||||||
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If you plan to shoot it and not clean it, and generally abuse it, get chrome lined. They are slightly less accurate, but they are easier to clean and stand up better to rough use. Military barrels are chrome lined. They may not be dead nuts accurate, but they get the job done.
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12-13-2018, 9:59am | #6 | ||||||
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The Palmetto state uppers are really good too. Their barrels are made by FN in Columbia SC. I have built a number of AR's using their parts. Sign up for their daily deals and you can find some real bargains. Go to Youtube for a tutorial on building the lower. Very easy. The only spring you have to be careful about is the forward takedown pin retainer/spring. A Xacto knife or a safety razor works well holding it in place as you slide the takedown pin through the receiver.
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12-13-2018, 3:50pm | #7 | |||||||
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On a related note, the .357 mag Ruger Blackhawk I inherited from my dad is a blast to shoot. I’m not used to cowboy type handgrips and balance. Thought it would impair my aim but that damn thing is accurate! |
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12-13-2018, 5:22pm | #8 | ||||||
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Another place for you to check out. I used on of their uppers in my last AR-15 build and it was very nice and the price is right. The nickle-boron EXO M16 BCG's are nice too.
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12-13-2018, 10:39pm | #9 | ||||||
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All mine have been chrome lined, but I also clean after every outing. Part of the therapy! I figure I'll never shoot more than a hundred yards so the twist ratio and ammo aren't that big a deal. I just sport shoot for fun, no competition. Usually use 55g. Cheaper and easier to find.
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12-14-2018, 12:48am | #10 | ||||||
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Back in 1983 I bought a complete new G.I. parts set (minus the lower receiver),
and built my first AR. I got a PWA lower for 59 bucks. It shot well but I've tried other uppers and Palmetto was great! But I never liked the idea of blowing hot gas and burned powder into the receiver so last month I picked up a new Adams Arms upper with 16" barrel. I also put a PDQ Ambidextrous bolt stop/release in because the stock release is left handed. Adams upper has no gas tube to the bolt, it's a gas piston-driven op-rod and the receiver runs cooler and much cleaner. Same idea as M1's and M14's/M1-A's. Added flip up sights. This thing is very accurate for the shorter barrel! I love the modular platform of the AR series! SO versatile!!! |
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12-14-2018, 10:01am | #11 | ||||||
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Ruger AR556 on sale now at Grabagun for $499, $10 shipping.
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12-15-2018, 7:39am | #12 | |||||||
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12-16-2018, 5:39am | #13 | ||||||
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The Adams gas block is adjustable! You can have an open gas setting for regular operation, or a partially restricted setting for hot loads or a completely closed port which is nice for silencers as it doesn't operate the action-you do it manually when you're ready to operate it slowly for hushing the action's mechanical noise. Just a depressing of a detent on the gas block and you turn the piston setting to desired operation. |
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12-16-2018, 11:05am | #14 | ||||||
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Bought a Palmetto 1:7 Nitrite 16” with BCG for $199 on sale ($299 regular price). I’m going to play with this one. I’ve only field stripped. I want to understand how the stock comes off, how the gas tube goes in and out, etc.
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12-16-2018, 6:06pm | #15 | ||||||
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Some recommendations I have. Make sure you have a good set of punches and an armorer’s wrench. Trust me when I say a decent AR wrench will save you a lot of anguish and possibly damaged parts. Another recommendation is to work in a well lit location with a smooth surface. I do not recommend working on ARs in a carpeted area. Little things like detent springs love to hide in carpet.
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12-16-2018, 6:39pm | #16 | |||||||
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12-16-2018, 8:29pm | #17 | |||||||
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12-17-2018, 5:43am | #18 | |||||||
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I've ground down the side of a couple of long punches to fit the landscape of the receiver and lower the longitudinal center of the punch to match the center of the roll pin I'm working with. Much better angle of attack and less prone to slip off. |
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12-17-2018, 8:32pm | #19 | |||||||
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12-17-2018, 8:36pm | #20 | ||||||
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