[Imran]

Educate me.

Suppose i have a 1/7 twist barrel on a mid-length 16" Upper w/ Daniel Defense M4 12.0 Rail


Which of these are better for this specific barrel?


The heavier 62 gr?

Federal .223 (5.56) 62grn M855 20rd Box

or the 55 gr?

Federal .223 XM193 55grn 20rd Box

I think i remember hearing that 1/7 twist is better for stabilizing heavier grain bullets. Is this correct, in that case i'd buy the first one, which is 62 gr? or is 62 gr still considered light?


I know that running lighter bullets in a 1/7 will tear them apart in the air, but assuming that heavier ammunition costs more, is a 1:7 twist upper really worth it?

Assuming that the heavier the bullet, the better it will be stabilized past 100 yards, i might as well compromise with the 62 gr ammunition rather than the 55 grain.

[Imran]

are PMAG's really worth the premium over steel GI mags?

[00vabchgt]

Originally Posted by Jakashh Educate me. Suppose i have a 1/7 twist barrel on a mid-length 16" Upper w/ Daniel Defense M4 12.0 Rail Which of these are better for this specific barrel? The heavier 62 gr? Federal .223 (5.56) 62grn M855 20rd Box or the 55 gr? Federal .223 XM193 55grn 20rd Box I think i remember hearing that 1/7 twist is better for stabilizing heavier grain bullets. Is this correct, in that case i'd buy the first one, which is 62 gr? or is 62 gr still considered light? I know that running lighter bullets in a 1/7 will tear them apart in the air, but assuming that heavier ammunition costs more, is a 1:7 twist upper really worth it? Assuming that the heavier the bullet, the better it will be stabilized past 100 yards, i might as well compromise with the 62 gr ammunition rather than the 55 grain.

You should be fine with either. I've heard that 1/7 is fine for 55gr- 77gr, and I've also heard it's fine for anything over 60gr. Remember that your POI will probably differ based on the ammo selected, so when you zero for one type of ammo (maker and weight), you'll have to re-zero for a different ammo if you change. Check out a few of the threads over on m4carbine.net if you haven't already. That place is a great resource. Just make sure to use the search function before posting over there...

[MyLILPwNy!]

https://www.libertygunsupply.com/Pro...040701&click=2

H&K. I will never use any other brand mag The Marines on our boat last deployment turned me onto these guys (got 8 for free WOO!) They go out and buy these and use them over their standard issue ones. To each his own but for me, I will never use anything else.

[Surgin]

You want to go with a lower grain when using a lower twist rate. I use a 55 grain for the 1/9 twist upper and 70+ grain for the 1/12 twist.

It seems to work well for my setups. This book was helpful as well,

Amazon.com: The AR-15 Complete Owner's Guide (9781888722109): Walt Kuleck: Books

Amazon.com: The AR-15 Complete Owner's Guide (9781888722109): Walt Kuleck: Books

[00vabchgt]

I'm pretty sure no one makes a 1/12 barrel for a 5.56/.223 AR, at least not anymore.. 1/12 is pretty common for 6.8mm and .308 Win. chambered AR's Most modern AR barrels in 5.56mm/ .223 will be 1/7, 1/8 or 1/9...

[00vabchgt]

Jakashh, check this out. I tried to find a good write up on m4carbine.net, but I couldn't, so I had to go to ar15.com. This should answer your questions on twist rates...

[.45ACP]

dpms makes alot with 1/12. atleast they used to. you def. need to use something a litle heavier with a 1/7. my DDXV had a 1/7.

[00vabchgt]

Originally Posted by .45ACP dpms makes alot with 1/12. atleast they used to. you def. need to use something a litle heavier with a 1/7. my DDXV had a 1/7.

Yeah, most of what's available nowadays is 1/7, 1/8, 1/9, I wasn't aware that anyone still made bbls in that twist rate. I know when the M16 was first issued, it had a 1/14 bbl for the 55gr ammo in use at the time. This was changed to 1/12 for increased stablity in cold weather. I've just never come across anything modern with a 1/12 twist rate in 5.56/223. My AR has a 1/7 bbl...

[.45ACP]

yeah now that i think about it, it seams like most of the basic dpms are 1/9. i wish i never sold my daniel deffense

[Whiskey11]

With a 1:7 twist rate, you will probably want to stick to some of the heavier rounds for use. I've read (meaning I've never had it happen ) that some 55grain rounds with enough powder out of a long enough barrel cause the rounds to fly apart. That said, a 1:7 should be great for launching the heavier rounds with great accuracy. You'll have to see when you go to the range which your gun likes best, but I bet the heavier will fly better out of your barrel than the lighter.

[2facedkillah]

Originally Posted by MyLILPwNy https://www.libertygunsupply.com/Pro...040701&click=2 H&K. I will never use any other brand mag The Marines on our boat last deployment turned me onto these guys (got 8 for free WOO!) They go out and buy these and use them over their standard issue ones. To each his own but for me, I will never use anything else.

The Pmag is far superior to the HK mags it isn't even funny. The HK mags were going for $50 a pop before the Pmag came out, once that happen HK dropped the price a bit, but not much. The Pmags are a lot stronger than anything else out there.
While the HK mag is better than a standard GI mag, putting in an anti-tilt follower in a GI mag makes it just as good as the HK. The only thing different about the HK is that the follower has slots in it to fit the anti-tilt guides in the magazine housing.
$15 for Pmag or $40+ for HK mag? If you don't see the difference go look at the tourture test videos on youtube.

[NastyFX4]

Originally Posted by 2facedkillah The Pmag is far superior to the HK mags it isn't even funny. The HK mags were going for $50 a pop before the Pmag came out, once that happen HK dropped the price a bit, but not much. The Pmags are a lot stronger than anything else out there. While the HK mag is better than a standard GI mag, putting in an anti-tilt follower in a GI mag makes it just as good as the HK. The only thing different about the HK is that the follower has slots in it to fit the anti-tilt guides in the magazine housing. $15 for Pmag or $40+ for HK mag? If you don't see the difference go look at the tourture test videos on youtube.

Agreed. The HK is nothing more than an upgraded GI Mag sold by HK so they believe it's worth it's weight in gold. I know quite a few Marines and myself would much rather rock the P-Mag vs either the USGI mag or the USGI mag graced by HK.

[Surgin]

Originally Posted by 00vabchgt I'm pretty sure no one makes a 1/12 barrel for a 5.56/.223 AR, at least not anymore.. 1/12 is pretty common for 6.8mm and .308 Win. chambered AR's Most modern AR barrels in 5.56mm/ .223 will be 1/7, 1/8 or 1/9...

Guess that upper is old, I didnt think 1/7 was that popular either.


Justin

[Imran]

I'll go for the PMAG's then. $14.20 on AIMsurplus. I'll look around for ammo, and if i don't find anything i'll just go for the 55 grain unless aim gets the 62 back in stock.

That one guy should let me know if he still has the Daniel Defense or CMMG w/DD railed uppers i want, if he has neither of them i'll just get a 1:9 spikes off their website.

[Drick]

I dont buy anything but the 1/1 twist. I like it.....

[Imran]

Originally Posted by Drick I dont buy anything but the 1/1 twist. I like it.....

Damn that's craaazzyyy. 1 turn in 1 inch. But then again, drick, you do have a 1" barrel...

[Imran]

I'm looking at buying a Magpul CTR to replace the standard M4 stock. I hate the M4 stock.

What other than the CTR would anyone suggest?

[00vabchgt]

My choices came down to the CTR or the Vltor Modstock. I checked them both out at one of my local shops and decided to go with the Modstock. The cheekweld was the biggest selling point. The Guy behind the counter also mentioned that he's tried both and the only problem with the CTR is that it tends to snag his beard. I have a beard too, but I was already sold on the Vltor anyway...

[swervo]

Originally Posted by 00vabchgt My choices came down to the CTR or the Vltor Modstock. I checked them both out at one of my local shops and decided to go with the Modstock. The cheekweld was the biggest selling point. The Guy behind the counter also mentioned that he's tried both and the only problem with the CTR is that it tends to snag his beard. I have a beard too, but I was already sold on the Vltor anyway...

I was just going to say that but you beat me to it.