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I've been having recurring FTFs with one of my Glocks where it'd either feed flawlessly or jam every other round for no obvious reason. Same ammo and everything.

I took a crippled female relative to the range today, fired off a mag with zero issues, handed her the gun, and watched it FTF every single round. I took the gun back and emptied the mag with zero feeding issues. Handed the gun back, and the problem returned. I watched her struggle through a few more rounds, took the gun back, and imitated her literally-a-cripple limp-wristed grip. Immediate FTF, exactly the same as I've seen off and on since I bought the gun. I cleared it, tightened my wrists up, and bang - no more problem.

It was super obvious once I saw someone else do it. I should have recorded myself in the past and I'd have spotted this inside of five minutes. I get tired, start using shitty form, and :shockedpikachu: the gun doesnt cycle properly.

I'm pleased as punch to have figured this out!

I've been having recurring FTFs with one of my Glocks where it'd either feed flawlessly or jam every other round for no obvious reason. Same ammo and everything. I took a crippled female relative to the range today, fired off a mag with zero issues, handed her the gun, and watched it FTF every single round. I took the gun back and emptied the mag with zero feeding issues. Handed the gun back, and the problem returned. I watched her struggle through a few more rounds, took the gun back, and imitated her literally-a-cripple limp-wristed grip. Immediate FTF, exactly the same as I've seen off and on since I bought the gun. I cleared it, tightened my wrists up, and bang - no more problem. It was super obvious once I saw someone else do it. I should have recorded myself in the past and I'd have spotted this inside of five minutes. I get tired, start using shitty form, and :shockedpikachu: the gun doesnt cycle properly. I'm pleased as punch to have figured this out!

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[–] • 0 pt

How new is the firearm and/or the return spring? If the answer is pretty new, then leave the slide locked to the rear for a few days and try again. This leaves the return spring compressed and will help break it in. Limp wristing, weak ammo, and strong spring all have similar effects and can compound the issue.

Pay attention to the ejection pattern of the brass. I've had new pistols quite literally eject the brass only a few inches, and a couple rounds even hitting my wrist. I fed it stronger ammo and it's better, but only ejected a foot or two. I broke in the spring as described above and problem solved. I did this with an AR as well when I bought a captured recoil spring.

[–] • 0 pt

Somewhere in the vicinity of a thousand rounds, so pretty new.

[–] • 0 pt

If that's the case, I'd very much try leaving it racked to the rear for a week or two and see if it helps. And make note of how far the brass flies.