Dolomite_supafly

Funny thing is those blank firing movie props are actually registered machine guns. So for him to have them in possession he is in violation of the law unless there is some sort of ruling that exempts him.   I will watch the movie because I guarantee it directly contributes to Marcus and he deserves everything he can get.   I have seen how bad the Korengal area can be. I would try to help every time a medevac chopper came in and that happened almost every day and sometimes several times each day. I was at the closest medical station to the Korengal valley so all casualties made their first stop at our base which was about 5 miles away. Heck, we got attacked pretty regularly but nothing like the outposts in the Korengal, they got hit daily.

Adding a heavy buffer and heavier springs only slows the bolt carrier down. The bolt is still unlocking earlier than if you have the gas adjusted to a proper level. And when it unlocks earlier the pressures are higher in the barrel and that blows more crude into the receiver and possibly into the shooters face. The gun unlocking early also causes more wear on the locking lugs. Adding a suppressor over gasses a gun too so why not do the same if a gun is over gassed without a suppressor. You do not hear of people adding heavy buffers when they run a suppressor, what they do is they reduce the gas.   There is a set pressure range at the carrier. I forget but rifle is somewhere under 19K psi and carbine is something like 34K. Now you can take an adjustable gas block and artificially lengthen the gas system and reduce pressures. You can take a 34K carbine gas system and adjust it down to the 19K rifle port and reduce the amount of crude, felt recoil and wear. From the gas port back all AR's are the same so you can reduce the high PSI of the carbine length gas system down to the PSI of the rifle system without issue.   The root cause of an over gassed gun is too much gas pressure reaching the bolt carrier. This causes the bolt to unlock earlier when the pressures in the barrel are still higher compared to a properly gassed gun. The easiest cure for reducing the pressure that reaches the bolt carrier is through the use of an adjustable gas block. A heavy buffer does nothing to reduce the amount of pressure reaching the bolt carrier.   Adding a heavy buffer adds unnecessary weight to the gun. And when that heavier buffer bottoms out on the buffer tube it causes more felt recoil that if a lighter buffer were used with an adjustable gas block. An upper should be what is tuned, not the lower. The reason why is the lower is supposed to work with any upper. If you monkey around with the lower because of a over gassed upper then when you put a properly gassed upper on that lower you are going to have cycling issues.   Another big reason to run an adjustable gas block is that over time the gas port itself becomes enlarged and elongated. This, in turn, increases pressures as well.   I have said it before, the heavy buffers were made by manufacturers to deal with their over gassed guns. And the reason why they make over gassed guns is likely for two reasons. First is so the gun will cycle with crappy ammo. Second is because they use the port size for a real M4 with a 14.5" barrel on their 16" M4 clones they make.   BTW, I have used a chronograph to test a lot of combloc ammo. I have yet to find a 55 grain load that has a velocity above 2,900 fps out of a 16" barrel.

What I use is some very thick leather. I go to Tandy Leather and buy a big sheet of it. I cut off a piece that will fold and fit inside the jaws of the vice. And for really stubborn barrel pour a little sugar around the barrel as you clamp it. You can even double up on the leather if need be but in years of using leather I can't recall ever needing two pieces.

There are some gas operated 9mm AR's but they are custom made. I have been told they shoot like 22's though.   A blowback 9mm will have a bigger recoil impulse than most 223 AR's.

I would spend the money on trigger upgrades first. There is a lot more accuracy to gain from a good trigger than from a good barrel.   If you are still wanting a barrel though I would look at the offerings by Green Mountain Barrel. I have used a bunch of them and they shoot extremely well.

If the ammo is for the carbine only and can never get mixed up and loaded in a pistol you can go a lot hotter. I use small rifle primers and I HAVE pushed the limits and beyond. I will not go into detail but I shot 90 grain FMJ's to 2,000 fps out of my blowback AR carbine in 9mm. I will say I was stupid and will never try it again. I will say the carbine showed no signs of problems after although he brass was ruined. Problems arise when a person tries to contain the pressure, like through a locked breech. But with a blowback it is a lot more forgiving when pressures are high. The recoil also goes up significantly. I tell people all the time that out of a carbine barrel the 9mm is transformed into a 357 magnum. Most bullet weights are similar between the two as well.

Here is 10 minutes of slow motion impacts with various bullets and various targets. I have literally watched this video at least 20 times over the years. http://www.youtube.com/watch?v=QfDoQwIAaXg

I would try to find one chambered in 32 NAA. The numbers say it is better than both 32 and 380 ACP.

Some people shoot a lot. For the average shooter it probably is not an issue but I know people who try to attend a class a month where they shoot 1k+ a day. In those cases I can see it eventually causing wear issues. It all depends on how hard you hold your trigger too. Personally I can see a lot of people getting tired of the trigger slap. I know I did with a semi auto MAC11 I owned for less than 24 hours.   Any time there is a pivot point with pressure on it there will be wear unless something is done to mitigate it. I have seen some FA lowers that had steel inserts installed in the hammer and trigger pin locations to prevent them from becoming egg shaped over time, especially 9mm lowers as they put a lot of strain on the trigger pins unless you run a ramped bolt.

I absolutely agree but what we don't need is a running anti ATF commentary. We all know where he stands and saying over and over again brings nothing to the discussion.   They have reversed their decisions in the past so we know it can happen and it is a valid concern.

The bolt coming back forces the trigger forward through the use of a lever. The fulcrum of the trigger being forced forward is the trigger pin. I can see the trigger pin hole in the lower become egg shaped over time with use. Maybe not immediate but eventually.

  We are discussing a trigger, not  your feelings towards the ATF or government. I would appreciate if you would leave it out of this thread.

I, for one am not "happy, happy, happy".   It was one show I enjoyed and looked forward to watching. Without it I have zero reason to change the channel to A&E any longer.

I am going to wait a couple of years before picking one up. The wait is for the company to work out any problems from use, like durability or possible damage to the lower. In that time the ATF will have had their chance to change their mind on the "legal" ruling by then. And, most importantly, the cost will come down or the copies will be out.

For those of you wondering, I am not affiliated with Micro Moa and was just posting something I ran across.   Second, a word of caution to Micro Moa. Do no advertise here. We require all commercial entities to become a vendor before they advertise here. I see no problem with linking something I have already linked but please do not advertise.   And finally, most of you will see I have been saying the same thing for a very, very long time about over gassed guns and the need for an adjustable gas block.   I do have a question though. Heat kills springs, it is a fact. The gas block does get extremely hot during firing, especially so with FA or faster firing rates, and that heat has to be transferred to the spring. So how do you mitigate the heat transfer to the spring in the gas block or does it even affect the springs performance?   This is a very ingenious way to solve a problem. I might have to look at it for my 300 Blackout when I SBR it.   Do you plan on making a version that clamps to the barrel rather than set screw to the barrel? I prefer the clamp version as I have seen some setscrew versions have issues with coming loose. I have also read that the setscrews on some blocks not lining up with the dimples in some barrels.

http://micromoa.com/   It has a plate with two different sized holes in it. The plate moves back and forth depending on the size of port you want.   This is pretty neat stuff.   Kind of pricey at $150 but all new stuff is.

We are talking about wood bees, not honey bees.

Hey guys, these are ready made bee loads. Seems everyone wants bee loads every year and these should work great.

If you build it as a pistol you do not need to pay the $200. Also if the gun's overall length is 26", regardless of the abrrel length, you can add a vertical grip because it is not considered a rifle or a pistol.   The benefit of a short barrel is it is easily manuverable compared to a 16" barrel. Then there is the added benefit if you are using a suppressor. Take a 16" barrel and screw a 8" suppressor on the end and then you have a gun that is miserable to manuver with. Screw that same 8" suppressor on an 8" barrel and you end up with a setup that is shorter than a 16" barrel.   The 300 Blackout works very well with a short barrel. Way better than a 5.56 out of short barrel. 5.56 will not reliably fragment beyond 25 yards with a 10.5" barrel. And if the twist is too fast it will not even tumble. So you end up with a very loud and obnoxious 22lr.   The 300 Blackout is more like a magnum pistol caliber than a rifle caliber. Because of this it is a dream in a short barrel.   And finally subsonic rounds tend to be more consistent the shorter the barrel. And consistency leads to accuracy.

Look at Nordic rails. I have one on one of my guns and love it. The rail is ~$100 and the rails vary up to $30 depending on size.

Not going to make it. The weather did me in and I will be in bed for a few days.

Are you getting the KNS for looks?

Shoot it and don't worry about the break in. The only thing I ever do is run a rod down the bore before shooting in case there is something left in the bore from the factory.

Who ever mine was thank you.   I will definitely be able to use everything in the box. I ammo can will go with me to the range because now what I use is old plastic jars. The snap caps will come in handy too as I do a lot with 22. The Leatherman will also get tossed in the range box too because I always find myself needing a pair of scissors. The call will also get used as I have been debating on hunting again. I haven't hunted anything for sport since 2001 and the call might be what gets me back outside.   Thanks again, I appreciate everything.

If you run an adjustable gas block it is easier to tune rather than the spring kits. Also, having the gas tuned correctly keeps the gun a lot cleaner, reduces felt recoil and reduces wear. And you can get a nice quality gas block for $50.