Different magwell specs?

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Different magwell specs?

Postby sigma_pete » Thu Aug 11, 2011 3:12 pm

Has OA changed the specs for the mag well on their newer pistol/rifle receivers when they started manufacturing the 9mm plastic mags? I recently purchased a WZxxxx serial numbered K23 pistol (barely used) and it's mag well is too narrow in width the accept either sten mags (have Hahn & OA adapters) or the old sten/welded block mags. I've tried over two dozen mags and only a couple will barely squeeze in if forced. These same mags fit just fine in my other lowers, 9mm and otherwise.
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Re: Different magwell specs?

Postby Globemaster » Thu Aug 11, 2011 3:54 pm

sigma_pete wrote: Has OA changed the specs for the mag well on their newer pistol/rifle receivers when they started manufacturing the 9mm plastic mags?

I’m no authority … but I doubt it.

sigma_pete wrote: I recently purchased a WZxxxx serial numbered K23 pistol (barely used) and it's mag well is too narrow in width the accept either sten mags (have Hahn & OA adapters) or the old sten/welded block mags.

sigma_pete wrote: I've tried over two dozen mags and only a couple will barely squeeze in if forced. These same mags fit just fine in my other lowers, 9mm and otherwise.

while I never had this issue; I have read where ‘others’ have sanded in the interior periphery of the mag-well, in order to get USGI type magazines to drop-freely.
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Re: Different magwell specs?

Postby Rattler » Fri Aug 12, 2011 7:04 am

No specs have changed. If you feel you have a magwell that is out of spec, call Oly and send it in for inspection.

Does it work with the magazine that was provided?
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Re: Different magwell specs?

Postby sigma_pete » Fri Aug 12, 2011 7:40 am

I bought it used and without a magazine. Since I'm not the original purchaser, would it be covered if out of spec?

What range of measurement would be within spec if I measure it with calipers?
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Re: Different magwell specs?

Postby Rattler » Fri Aug 12, 2011 11:00 am

sigma_pete wrote:I bought it used and without a magazine. Since I'm not the original purchaser, would it be covered if out of spec?

What range of measurement would be within spec if I measure it with calipers?


If it is an unaltered factory Olympic lower it has a lifetime warranty against manufacturers defects. If you desire warranty service, you'll have to do so by contacting Oly directly, and sending the lower in to them for inspection. No way around it.
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Re: Different magwell specs?

Postby Globemaster » Fri Aug 12, 2011 1:27 pm

sigma_pete wrote:What range of measurement would be within spec if I measure it with calipers?

it looks to be in the neighborhood of .898 if I'm reading that pdf-file blueprint correctly.


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Re: Different magwell specs?

Postby sigma_pete » Sat Jun 30, 2012 12:37 pm

Update... Olympic Arms higher quality control resulted in issues for my original intended purpose but all is good because it now sports a 10.5" 5.56 upper.

At the time I posted this, I couldn't find my digit calipers so I used a cheap set that I did have in my reloading box. While far from being precise, it would appear that there was nothing wrong with the Olympic Arms receiver's mag well.

The Olympic Arms mag well appeared to be within spec, while the Spikes Tactical was over sized which is why it could accept everything that I have. I have about 3 dozen Sten mags between standard mags and the mag/block conversions. Somewhere around 1/3 and 1/2 of the mags wouldn't fit in the Oly receiver because the mags are a hair too wide. I found the same issue when I tried these same mags in a Stag Arms rifle receiver. I've had to stick with the Spikes lower for 9mm and re-purpose the Oly receiver for use with a different caliber round since I don't plan on buying any "new" factory mags because of my current investment in the Sten configuration.
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Re: Different magwell specs?

Postby Globemaster » Sat Jun 30, 2012 1:30 pm

The Olympic Arms mag well appeared to be within spec

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Re: Different magwell specs?

Postby John A. » Sat Jun 30, 2012 1:51 pm

I've seriously considered buying an Oly 9mm upper and a magwell conversion block several different times, but realistically, I have enough 9mm weapons to keep me content.
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Re: Different magwell specs?

Postby Rattler » Tue Jul 03, 2012 5:58 am

sigma_pete wrote: The Olympic Arms mag well appeared to be within spec, while the Spikes Tactical was over sized which is why it could accept everything that I have.


As we have been preaching here for years.

Even when there was quite a bit of rancor on the subject with more internet bulletin board experts, hiding behind their keyboards and spewing hate and malcontent, as well as vicious rumors that Oly's lowers were not "mil-spec" (not even considering the fact that if ANY lower is not machined to be a select-fire receiver that it is not "mil-spec [dolts]), that while the tolerances were much tighter than most other receivers by other brand names (most of them made by the same TWO machine shops), they proved overwhelmingly to be well within spec. In the end, while the anonymous fools on "other forums" related to poor quality of Olympic lowers, all the match shooters and high-power competitors WANTED them, because in the end, they produced more accurate rifles. A goal that Olympic has been supporting since 1976.
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