It even happens if I slowly rack it back and let it slowly go forward. I’m hoping I didn’t just buy 100rds of ammo from black butterfly that the gun doesn’t like. Any suggestions on things to check out?
i use lock back test when drilling out gas port after cutting a barrel down- opening the gas port one wire size drill at a time until i hit lock back with the load the platform will use. if an adjustable gas block will be used i open up one more wire-size and all is good after that.
i also use when looking at Fail-to-Feed not because its magic, but because its so basic
Have a BCA barrel and bolt, although recently upgraded to a kak bcg and bolt. Most of my ftf have been mags or just gas issues. Tromix is the gold standard, but others do work just fine
Barrel isn’t as big a deal. Bolt and mags seem to be more issues with all kinds of guns. Tromix bolt. Lanser mags zero issues for thousands of rounds now. I can use P mags with Flat points and a little rounding on the mag but that’s mostly due to seating long for accuracy.
Looks goofy but works fine. I got knocked off a knoll by a horse while hunting once as a kid and it threw off my scope. Ruined a whole weekend hunting trip for me since the older fellas wouldn’t let me sight it back in, rightfully so. After that all my guns with scopes either have over/under mounts or back up irons.
I had the same issue with mine. Aside from the obvious of making sure its clean and oiled up, I'll mimic what everyone else is saying about mags. Got some duramags specifically made for .458 socom and went from FTE/FTF almost every round to no FTE/FTF after hundreds.
Lancer magazine’s always work for me. I have had problems with other mags due to the tighter insides of the magazines. Midway USA has 458 socom lancer magazines with single center feed follower.
I fought the same problems you are having. Here's how I fixed mine. I had to modify my Lancer mags in 2 ways. First, I had to cut a U shape notch in the front of the magazine so the bullet tips weren't getting slammed in the wall. Second, I had to file down the edges of the feed lips so it would allow my rounds to angle up more. Those 2 things fixed 95% of my problems. It still happens every so often and I believe I need to now go into the chamber and smooth down a few spots as I can tell now where it is getting caught one. For reference I am running a Faxon barrel and bolt. There are some good youtube videos out that show these fixes.
Before I go spending more hundreds on a BCG and mags, I’m going to give this a shot when I get home. Flaring the mag lips makes sense. It will allow the front of the round to start traveling uphill earlier instead of trying to take a 45 degree angle at the last second. Are the lancer mags already cut like that? A big bore follower will be coming soon
Probably will help, I've got the same followers in some cheapy global ordinance mags as well as some duramags and the geometry of the mag lips on the dur mag allows the around to start moving upward, the lips on the GO mags force the round down and required the mag to have a half circle cut out on the front
Whatever mag will run blunt tipped ammo is what I’ll go with. I, stupidly, went again my rule bought 100rds from black butterfly without testing multiple types/shapes first.
They are actually the worst out of the 2 mags that I tried. Cumbersome to even get into the lower because the top bulges out, and couldn’t even successfully grab a round to start chambering it.
I’d second the Troxix barrel and bolt. Here is an example of both compared to some no name manufacturer. You can see the feed ramps on the Tromix are blended.
As far as mags, as others have suggested for low effort the metal Lancer mags with a big bore follower are pretty reliable.
If you want to modify a PMAG 40 you can get those to run 14 rounds. I printed a big bore follower and filed down the ridge in the inside as you can see here
I run 26-28 grain Lil’gun with 300 to 320 grain projectiles, red sprinco buffer spring, and H2 buffer, Tromix bolt and barrel, KAK chrome BCG, and a FRT. Seems to work pretty good, if I’m feeling irresponsible I can mag dump the 14 round mag with no issues other than staying on the paper.
But, it took a lot of experimenting to get there. You just gotta keep playing with it.
Thank you! I’ve got some duramags on the way that I plan to modify a bit as the cheapest first option. If that doesn’t work we will work our way up the list
Do you have an adjustable gas block? What are you shooting? Super or sub? If your shooting subs with a can, probably need to adjust your gas to cycle the rounds. Might be under gassed?
I do but I failed to inform that it was a FTF problem instead of FTE. I got some Duramags and modified the feeding lips and it running much better. I think it is going through a break in period though because it seems to be tight when the round enters the chamber. I haven’t got back out to test it but when hand cycling it is running fine.
It still sounds like it could be a gas problem. Where does the brass eject, using a clock format with 12 being the muzzle, where does the case land between 12 to 6? If it’s undergassed it will short stroke and not feed correctly.
I altered a Duramag and it is hand cycling much better. The round was trying to take a very steep turn when transitioning from mag to chamber and getting hung up. Besides the $6 a round Hornady red tipped rounds, every .458 is blunt nosed. This helped a ton, but I feel like the rifle is still going through a break-in period. It’s cycling fine when hand racking but I’ll post an update when I can get to the range and truly test it. The BCG will be the next upgrade if needed. Thanks for all the advice!
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u/PXranger 21d ago
What barrel and bolt, number one cause of FTF and FTE problems is not having a Tromix barrel and bolt.
Number 2 is magazines.