I bought a couple boxes to try too, I'll let you know how mine shoot soon. Do you have an adjustable gas block? Setting ? Did you try loading one round and seeing if the bolt locks back after firing ?
Joe
-
Hey Guest, it looks like you haven't made your first post yet. Until you make an introduction thread, the rest of the site is locked to posting. Why not take a few minutes to say hi!
Federal 115 MSR
Bought some 115 MSR to try out as I am looking at other options than my standby load, 120 SST. I loaded 5 rds in my 15rd mag and attempted to shoot. Each rd failed to properly eject. Fired case gets jammed sideways is ejection port while bolt is trying to feed new rd into the chamber. The only ammo this set up has seen is factory 120 SST and I have had no issues. I Loaded 5 rds of 120 SST into same mag and fired away with no issues. I have seen a few posts about known issues with this ammo but do not recall anyone figuring it out. Is the powder being used the problem for some?
I might try some Double Tap 100gr AB next.. Anyone have any experience with that load?
I might try some Double Tap 100gr AB next.. Anyone have any experience with that load?
1 - 20 of 46 Posts
Joe
I've never had that issue with the 115 MSR fusions... Maybe overgassed? Do the cases look cloudy? Might prevent the case from fully extracting in time to eject and let the new case load. I had that problem with S&Bs... Adjustable gas block fixed it.
I don't have a adjustable gas block right now but may upgrade in the future. Going to try the 1 rd loaded thing today and will report back.
This has been brought up on multiple occasions.
I've found the fusions to be very accurate factory rounds. They've performed well on deer as well.
As far as cycling, that depends on your set up, including the barrel gas port size paired with your BCG, buffer weight and spring.
Carbine buffer & spring with a full auto BCG you need a .082 gas port to reliably cycle it.
I've found the fusions to be very accurate factory rounds. They've performed well on deer as well.
As far as cycling, that depends on your set up, including the barrel gas port size paired with your BCG, buffer weight and spring.
Carbine buffer & spring with a full auto BCG you need a .082 gas port to reliably cycle it.
I have ARP Socom barrel and full auto BCG. Will Adj gas block fix it? If so which one? I know nothing about them.This has been brought up on multiple occasions.
I've found the fusions to be very accurate factory rounds. They've performed well on deer as well.
As far as cycling, that depends on your set up, including the barrel gas port size paired with your BCG, buffer weight and spring.
Carbine buffer & spring with a full auto BCG you need a .082 gas port to reliably cycle it.
just looked at the 5 fired S&B cases and the don't look to be cloudy. I think I am goi got order an adjustable GB and see if works.I've never had that issue with the 115 MSR fusions... Maybe overgassed? Do the cases look cloudy? Might prevent the case from fully extracting in time to eject and let the new case load. I had that problem with S&Bs... Adjustable gas block fixed it.
SLR makes a great one.. it's a little pricey though.
An adjustable gas block "will not fix it", its most likely under gassed. The 120 sst ammo is hotter.I have ARP Socom barrel and full auto BCG. Will Adj gas block fix it? If so which one? I know nothing about them.
Load 1 round of fusion in the magazine, chamber and fire it, what happens?
Does it fully extract and eject?
Check the BCG to see if it fully locks back and locked back on the bolt not the lip of the carrier.
I would agree... What you were describing happened to me with S&Bs.. but they were cloudy. Never had the issue with 115 fusions.An adjustable gas block "will not fix it", its most likely under gassed. The 120 sst ammo is hotter.I have ARP Socom barrel and full auto BCG. Will Adj gas block fix it? If so which one? I know nothing about them.
Load 1 round of fusion in the magazine, chamber and fire it, what happens?
Does it fully extract and eject?
Check the BCG to see if it fully locks back and locked back on the bolt not the lip of the carrier.
1 rd of 115gr Fusion loaded and fired. Here are the results...An adjustable gas block "will not fix it", its most likely under gassed. The 120 sst ammo is hotter.
Load 1 round of fusion in the magazine, chamber and fire it, what happens?
Does it fully extract and eject?
Check the BCG to see if it fully locks back and locked back on the bolt not the lip of the carrier.
1 rd of SST loaded and fired from the same 15 rd mag, no problems.
did the bolt lock back with the bolt stop? or did you do finish pulling the bolt to the rear to lock it? if it locked open on the stop when you fired it, i'd say you have a ejector or extractor issue.
yeah that's odd,,, i would think if it cleared the chamber, it would eject. no matter what load,,, maybe the 120 has enough gas to drive the bolt back and clear the casing. don't worry, someone on here will have the fix,,, nice looking setup! l like it.1 rd of 115gr Fusion loaded and fired. Here are the results...
![]()
1 rd of SST loaded and fired from the same 15 rd mag, no problems.
Thanks! The SST shoots just fine and may just stay with that.yeah that's odd,,, i would think if it cleared the chamber, it would eject. no matter what load,,, maybe the 120 has enough gas to drive the bolt back and clear the casing. don't worry, someone on here will have the fix,,, nice looking setup! l like it.
try putting an empty case in the chamber drop the bolt on it, then pull the bolt to the rear slowly and see what happens, see if the case flings clear of the port or flips around like in the pic.
ARP barrels sometimes seem to have smaller gas ports than other barrels. If that is the case, an adjustable gas block is not going to help--you'll need to drill the port out in the barrel slightly. ARP mentions this as a solution and even gives a drill size. It's not hard. A drill press is best but not totally required. Just stick a cleaning rod in there first so if you overshoot the bottom of the hole you won't score the inside of the barrel.
Alternatively, do you have a semi-auto bolt carrier on another rifle? You can just try throwing that in if you think it's under gassed. You either add gas (bigger port) or reduce weight/spring resistance at the back. You can also throw in a lighter buffer.
All my rifles run fine with both 120 SST and 115 fusion.
Alternatively, do you have a semi-auto bolt carrier on another rifle? You can just try throwing that in if you think it's under gassed. You either add gas (bigger port) or reduce weight/spring resistance at the back. You can also throw in a lighter buffer.
All my rifles run fine with both 120 SST and 115 fusion.
Is this gun a new build or broken in?Thanks! The SST shoots just fine and may just stay with that.
Is the BCG dry?
Disassemble the BCG and use a good lube; apply to the bolt body, gas rings and cam pin, reassemble. Lube the carrier rails where the carrier rides in the upper and shoot it again.
Current BCG is not Dry, I like to run things on the wet side. I do have a semi auto BCG I will try. This set is not new but rd count is only around 40. I will break down the 68 BCG clean,lube and see what that does.
What 762atx said. I have an ARP barrel that I had to switch carriers to a semi auto for the MSR federals.
Shot the 115 Fusions in two different guns, and two different magazines, no issues, proper ejection pattern on both. I would look at the gas system. Don't forget to make sure the gas rings are aligned properly.Current BCG is not Dry, I like to run things on the wet side. I do have a semi auto BCG I will try. This set is not new but rd count is only around 40. I will break down the 68 BCG clean,lube and see what that does.
You should also take a picture of the empty Fusion brass, lets see the case head and extractor area on the brass. Wouldn't hurt to make sure the ejector is ok and extractor spring?
I know you said that the Hornady 120 SSTs are working fine and you might go back to them, but the gun should function with the 115 Fusions too. Something is not right and I'd find out what and fix it regardless of if you switch back to the 120's
Thanks, Joe
1 - 20 of 46 Posts
6.8 SPC Forums
A forum community dedicated to 6.8 SPC firearm owners and enthusiasts. Come join the discussion about optics, hunting, gunsmithing, styles, reviews, accessories, classifieds, and more!
Full Forum Listing
Recommended Communities
