This is temp build and dry function testing only. 3 rounds in mag and all fed and ejected fine. Test (dummy) rounds @ 2.830", 2.020" trim length and Lapua 144fmj. Throated +.100" to 144's. Barrel 6.5prc, 8 twist, modified hbar, .875" gas journal, .100" gas port, 22" length and is double feed (m4 style extension).
Magnum AR Project
- Thread starter Masczek
- Start date
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codyadams
Well-Known Member
I'm thinking one of these built on the new Ruger reciever would be sweet. A magnum ar in an ar15 sized package....
I don't think the bolt would be that good for use. Maybe a low powered magnum.
Masczek
Well-Known Member
What length gas system does your 358 WSM have?
Rifle +2"
Masczek
Well-Known Member
This wouldn't be a VA Silent Arsenal rifle would it?
No, I had the barrel built
texas
Well-Known Member
I'd like to know more about your setup.
For the love of God fellas....
This thread is about Masczek's build....
That's all I care about here.
Masczek
Well-Known Member
I finally found that a .077 gas port is the size that works best for the setup that I currently have. Dwell time still seems a bit quick since some of the rims are only very slightly raised, but not all of them. I currently have a 5oz buffer, I'm thinking a slightly heavier buffer will give me the perfect recipe.
That being said, has anyone had their AR have cycling issues when having a heavy optic installed on it? I'm also getting ready to build a version 3 receiver, more on that to come as well.
That being said, has anyone had their AR have cycling issues when having a heavy optic installed on it? I'm also getting ready to build a version 3 receiver, more on that to come as well.
wvbearhunter
Well-Known Member
I have heard of this with the SCAR 17s when using an Elcan but not with an AR pattern
If it's taking the actual rearward movement of an automatic then something is wrong. On those doesn't use a buffer tube I have no idea? As an AR platform goes it shouldn't be an issue with a heavy optic or any other added weight. I've had 3.5# AR's to 15.5# 1's also. As long as the gas system is tuned to the bolt, buffer and recoil spring all is good. Don't choke the gas in this case if you feel the port is sized well enough, just add weight to the buffer as a heavier spring doesn't really help dwell time only rebound. This is what I've found and other might have found a different method? I've changed carrier weight, buffer weight and recoil spring tension for various cartridges with different powers. Another thought is the B5 system..........might not make sense here, but give it a go. I would go with an h3/h4 buffer (5.3-6.5oz) with the rifle length spring. I can still send you the real heavy buffer I have for you to try (9.3oz), if you're interested? I ask for nothing in return as only too help you in your quest!
