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I recently purchased a gen 2 in .40. Functions fine and overall pretty happy. I installed a Red Lion fire end and have noticed a lot of up/down barrel play. Has anyone else experienced this? Is this just a Sub "thing" or is it related to fire end install in your opinion? Thanks!
 

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Sounds like your lock up on the trigger guard is loose. The good news is it's pretty easy to adjust. The bad news is you have to remove the forearm to do it.

1. With the forearm removed and the Sub open and locked look for the round barrel nut against the receiver.

2. Tighten the barrel nut by HAND ONLY so it is hand tight against the receiver. Test the tension by releasing the trigger guard and folding and opening the barrel. The trigger guard should JUST seat as the barrel is reaching full extension. Any sooner and you may be loose, any tighter and the trigger guard either may not lock or you may have trouble releasing it. You can use a towel or something similar to hold the nut, BUT DO NOT TIGHTEN IT WITH A TOOL.

3. While keeping the barrel nut from moving, re-install the forearm. The forearm is what holds tension on the barrel nut and prevents it from loosening.

Let us know if this helped or not.
 
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I just bought a used gen 2 Glock 17 model and had the same issue. Tightened the barrel nut and it still moved. Contacted kel tec and was told I'd have to send it in not under warranty. Did some more digging here and placed 2 stips of electrical tape on the front of the reciever and it's locked up tight as can be. Anyone else try this?
 

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I just bought a used gen 2 Glock 17 model and had the same issue. Tightened the barrel nut and it still moved. Contacted kel tec and was told I'd have to send it in not under warranty. Did some more digging here and placed 2 stips of electrical tape on the front of the reciever and it's locked up tight as can be. Anyone else try this?
Where did you put the tape? Photo
 

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I had the same complaint. Loose barrel / handguard fit.

KT took care of it by replacing hand guard, barrel and receiver.

Even if it’s out of warranty - no receipt - they don’t charge much.
 

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This is what they told me.


“If you cannot supply the purchase receipt for the firearm, it will be considered non-warranty and there will be about $25 in return shipping fees and might be a $40 labor fee if needed.”
 

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FWIW when I had to ship my CMR-30 back to KT for warranty work, the pre-paid shipping label was marked ‘machine parts’. I’ve read that some carriers will upcharge quite a bit for anything tagged as a firearm. And the rules for shipping a pistol/ handgun are quite a bit stricter.

If I had to send my Sub2K back to KT on my dime I’d either use FedEx and tag it as Machine Parts or take it to my local gun shop and let him ship it. I understand FFLs can ship USPS too.
 

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I recently purchased a gen 2 in .40. Functions fine and overall pretty happy. I installed a Red Lion fire end and have noticed a lot of up/down barrel play. Has anyone else experienced this? Is this just a Sub "thing" or is it related to fire end install in your opinion? Thanks!
I had the same issue with a new gen 2 glock 17 I just purchased. Found barrel nut is loc-tited in placed and didn't want to heat it at this time. Took some electrical tape, folded it against itself so no sticky side. Took handguard off. Slipped electrical tape strips between washer and square block behind nut on each side, now it locks up tight. The handguard put back in place will keep the electrical tape in place. Perhaps someday I will heat the Loctite and tighten down the nut, but works for now.
 
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