Kaiser Defense AR 15 Lower Issues

[10ring45]

I was recently at my gunsmith's shop and he had a Kaiser Defense lower in the vice and the buffer spring tube STUCK on the lower itself, well long story short he got it on there so tight and it had a HUGE gap between the receiver and the buffer spring tube where they should have been flush.

We finally got the stuck buffer spring tube off and it came off in pieces. Then we took a micrometer to the lower itself and found that moving from the rear of the threads on the receiver the front of the threads on the receiver there was a decent discrepancy (I do not remember the exact measurements) enough to cause the buffer spring to be short almost 3/8 of an inch maybe more. So he had to order a TAP so that he can fix the threading of the receiver.

To shorten this already long story, I ordered and DROS'd 3 of the KD lowers from Royal Loan (outstanding customer service) and I was concerned that my three lowers may exhibit this problem, has anyone else experienced this problem with the KD lowers?

[gunsmithcats]

i'd call kaiser and tell them to unf^ck that now

[10ring45]

I agree but he said he could fix it. However if mine are the same way I will be at KD front door step with a buffer spring and buttstock.

[Seesm]

Sounds like a machining flaw one one the pieces...

When you make threads a certain pitch is used and sounds like one is tight and one is loose...

So that is sometimes the problem with two different parts manufactures. Not to say it can not happen with two pieces from the same company but it's less likely as most would test fit but the whole lot of OLL out there they are test fitting everyones parts as thye should be I bet.

I would hold off on the tap "temorarily" anyway and just call up Kaiser and see if they can fix them all free of charge.

I bet they know they have a issue (if it's there part that is wrong..)

My way to check would be if the other piece will thread into another brand lower ok...

Pm me if you have any specific questions and I may be able to help you.

[damon1272]

They are a local company if you have any problems. they have posted on thsi board before and seem eager to sell. I would at this point give them the benefit of the doubt. Just check your lowers for fit when you get them and if not go to thier place of business. As for the out of spec lower I would say the gunsmith is not doing right by the customer. That lower should be returned and replaced for a lower that is correct rather than wasting time and money fixing something that was not right in the first place.
I had the same thing with my old man's Cooper rifle. They tried to talk me into using Burris scope rings to make up for the fact that the scope mounting holes were not drilled properly. I made them replace the receiver to make it right rather than dealing with an expensive piece of junk.

[ifishinxs]

I have a Kaiser lower and its perfect. When Installed the buffer tube it was snug. I used some anti seize grease I had laying around and worked the tube on and off serveral times working further into the receiver threads each time..
Now it screws on and off easliy. ( still snug)

[Trapper]

Kaiser Defense is based here in SD. I'd call them, explain the problem and give them an opertunity to correct the threads on the lower.
619-987-4764

[gtmmark]

When I saw this post I pulled my Kaiser out of the safe and sure enough I was only able to screw the buffer tube in part way. The buffer tube is a Bushmaster.

[Axewound]

well i got one, before the election and would tell you about my experience...but all of my parts are on backorder since before halloween.

so at least you can build yours

[5aa12]

Man..I pick up my KD lower on the 22nd...hope its not a common problem..but if so, I agree you should go to them and have them fix it right the first time without work arounds to make it "Ok"

[hamster]

i just put my buffer tube in today to complete my lower and it fit like a glove... see for yourself!

[paladin4415]

If the lower has a problem they will fix it. Just ask. They are very good people.

[USMC Tanker]

I tried to thread my LMT buffer tube onto my Kaiser lower today.

It was REALLY snug. I might try some grease tomorrow and try to work it on/off a few times.

Let me know what happens with yours and I'll do the same.

[alleyehave]

Mine fit great, no problems.

[XS40]

Between what range of serial numbers was the one that had bad threads from? 0-200, 200-400, etc. I've got two on DROS and am curious to know if the problem is recent or on older serials.