Glock 20 locks open with ammo in magazine when suppressed. Can you help figure it out?

Questions and answers, photos, videos, and discussion.

Moderators: mpallett, bakerjw

Post Reply
CH0
New Member
Posts: 1
Joined: Wed Jul 25, 2018 7:54 pm

Glock 20 locks open with ammo in magazine when suppressed. Can you help figure it out?

Post by CH0 »

I am having trouble with my Octane 45 on my Glock 20. The gun will frequently lock open with rounds still in the magazine. It locks all the way back, slide stop engaged. The gun functions perfectly un-suppressed. I am using a KKM barrel. The suppressor booster and O-ring are well lubricated with lithium grease.
I initially thought it must be way over-gassed, so I tried the following things to slow down the slide:

1. Heaver recoil spring (Wolff) up to the 24 lb maximum
2. Extra power magazine springs
3. Hand loading subsonic 10mm (200 gr @ 950 FPS)

Even with all three together, it still locks open prematurely. I don't have any other guns to test the suppressor on, but I can't imagine the suppressor itself is the issue (sounds like it's working very well). Could it just be all the extra weight on the end of a tilting barrel that's causing the problem, rather than too much gas? I would really appreciate your help, given how long I've waited for this suppressor! I was thinking of getting a Glock 19 as well, but don't want to have the same issue if it's a Glock thing.
User avatar
CanOfWhooppass
Silent But Deadly
Posts: 482
Joined: Thu Dec 10, 2015 3:03 pm
Location: South Florida

Re: Glock 20 locks open with ammo in magazine when suppressed. Can you help figure it out?

Post by CanOfWhooppass »

If the slide is locking back with rounds still in the magazine it can not be the magazine follower pressing up on the slide lock.
But, if it is being engaged, so it has upward pressure from:

Inside- maybe bullets rubbing

Outside- are you sure your grip is no where near the lever?

Inertia- make sure the spring that hold the lever down has enough tension.

Does it happen regardless of ammo type and number of rounds in magazine? Have you tried different magazines?
Does it happen one handed or with your off hand also?

I have a Glock 20 KKM barrel, GA Revolution 45 and have had no problems at all.
It's not a silencer, it's a can of whoopass!
Post Reply