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Mag Springs and Snap Caps vs WRA Dummy Rounds

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sling00 View Drop Down
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Joined: Apr 21 2016
Location: Tennessee
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    Posted: Apr 16 2018 at 4:16pm
I was “test driving” a couple new mags, a freshly unwrapped IS and a Keep On Shooting after market and had a couple issues.  I was using 2 Snap Caps and found the second round would not cycle in the KOS.  Upon disassembly I found that it has 5 ½ coils (5 on the GI mags) which has the “high side” looking correct at the base plate but it is opposite what it needs on the follower.  I turned it around and seems to be working OK now.  I know backwards springs are a common issue but for these you need to take it all way out to verify the “high side”.  Also as a side note the KOS has some sharp edges so I smoothed them up a bit.  Next I found the Snap Caps were inconsistent on engaging the bolt and ejecting.  Before panicking thinking I could have extractor issues, I found my WRA 1944 dummy rounds and tried them.  I had no issues with them.  I mic’d the rim of the two and best I could tell the Snap Caps may be .003” smaller diameter.  As for rim thickness I’m not sure as the 35 degree chamfer made measurement difficult with my $14.95 digital mic. They looked similar to me.  Has anyone had similar issues using Snap Caps?  
One more thing, I found Dupage Trading has 1944 Winchester M13 dummy carbine cartridges, new condition in a sealed 50 round box if anyone needs some.  Same as the ones I used today.  17 boxes left after I bought a box.
http://www.dupagetrading.com/product/winchester-m13-dummy-carbine-cartridges/
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