issues with 10 round XCR mags w/ SKS adapter

edojan

edojan

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Some time ago I picked up an sks with hical adapter installed from a fellow cgn member. I also purchased some xcr mags to go with it. The mod mostly functions ok, but the key word here is "mostly" because once in a while the rounds get stuck in the mag resulting in FTFs. Occasionally, after shooting the first 3-4 rounds the next cartridge in the mag jams because it either nose dives or bottom dive thus causing the feeding issue.
I have discovered that FTFs do not occur if the cartridges in the mag were carefully aligned at the back of the magazine (i.e. when loading the magazine from time to time one would turn it on its rib with the bullet facing up and gently tap the spine against the palm of your hand or some other surface. this would cause all the cartridges shift towards the back of the magazine and be aligned against its spine)

If the mag is shot without this extra step FTF is very likely to result.
I wonder if other users of the XCR mag experience similar issues. I don't think this is the adapter because as mentioned earlier the issues seem to be caused by the mag.

On the same subject, does any one know if C Products Defense mags are any better than the regular XCR ones (C Product Devense mags supposedly have a better spring and can be distinguished by a bright orange follower.
 
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everytime i use my xcr-l in 7.62x39 mm with the pistol mag after i load the mag i tap the top of the mag in my hand wich align all the round to the top otherwise i get sometime the issue you say , it because Ar mag dont have that taper that ak or Vz got ,
 
I've been having issues too but I think it's the mags, they don't fit 10 rounds fully I can get 8 or 9 in and it's very tight , very tight to strip the first few rounds off with my thumb, may be robbing the bolt the momentum it needs to slam the round In the chamber. I also get the rounds pointing up too much too and it roofs into the chamber and bolt jams up. Never had them hang up under the feed ramp though...
 
Deuce-deuce said:
Put it back the way mother Russia intended. I'll bet your issues go away.
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I also own unmodified sks rifles - this one is an experiment of sorts. The irony of the situation has been discussed a few times already: we start with a perfectly functioning 10 round capacity rifle, pay a fee to restrict the capacity to 5 and then pay even a bigger fee to restore it back to 10... My biggest concern though is not the cost but a significant deterioration in the reliability department
 
I've got 2 Hical adapter modded SKS and have user multiple magszines and I can say for certain that any problems are magazine related and not adapter issues.

Ammo alignment is important as you mentioned. 9 rounds usually work better than 10. Some individual mags are consistently problematic while others run perfectly. 10th round is a very tight fit and often sends smmo out of alignment.

I'm tempted to disassemble some mags and see if I can trim the follower a bit to fit 10.5 rounds.as they come, some mags seem
To be 9.95 :)
 
Gatehouse said:
10th round is a very tight fit and often sends smmo out of alignment.

I'm tempted to disassemble some mags and see if I can trim the follower a bit to fit 10.5 rounds.as they come, some mags seem
To be 9.95 :)
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Shaving off from 2 to 2.5 mm from the bottom of the long leg of the follower does the trick when trying to insert the mag with 10 rounds on the closed bolt. However, it doesn't solve the FTF issue - you still need to align. When trimming the follower make sure the resulting capacity doesn't exceed 10.5 or 10.7 i.e. don't get too close to 11 (or the 11th round could potentially be squeezed in, even though this would cause the mag to bulge a bit; but then you may find yourself in a legal pickle arguing that increasing the capacity to 11 rounds was not your real intention).
 
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edojan said:
I also own unmodified sks rifles - this one is an experiment of sorts. The irony of the situation has been discussed a few times already: we start with a perfectly functioning 10 round capacity rifle, pay a fee to restrict the capacity to 5 and then pay even a bigger fee to restore it back to 10... My biggest concern though is not the cost but a significant deterioration in the reliability department
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I don't really understand how the conversion makes it legal to have the 10 round capacity? Forgive my ignorance.
 
collector67 said:
I don't really understand how the conversion makes it legal to have the 10 round capacity? Forgive my ignorance.
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Because "pistol" magazines are restricted to ten rounds. This adapter in question allows for the use of pistol magazines... Well that and our laws are retarded.
Regardless, I fail to see how awkward, unreliable ten round magazines are better than a (limited) 5/10 reliable factory mag.
 
collector67 said:
I don't really understand how the conversion makes it legal to have the 10 round capacity? Forgive my ignorance.
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The conversion modifies the rifle to accept pistol magazines. Since at least one manufacturer produces 7.62x39 pistols (XCR micro) there are 10 round magazines designed for this round. The Canadian law restricts the magazine capacity, not the weapon capacity. This means that 10 round pistol magazines can be used in SKS if you equip it with a specially made magwell adapter.
 
I had the exact issue you are having and this was the cure for it.

I took my rifle into HiCal and Dave personally machined some M4 style feed ramps thus directing the rounds upwards and eliminating the nose diving problem.

My rifle runs like a freaking champ with all of my magazines now after I had that final tweak performed.

 
Grove said:
I had the exact issue you are having and this was the cure for it.

I took my rifle into HiCal and Dave personally machined some M4 style feed ramps thus directing the rounds upwards and eliminating the nose diving problem.

My rifle runs like a freaking champ with all of my magazines now after I had that final tweak performed.
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Interesting. There are two different styles of M4 ramps - with one or two groves. Which one do you have? Also, do you know if the barrel had to be removed in order to do this job or did he machined it without detaching it from the receiver?
 
I always give my xcr mags a whack on the rear to seat the rounds back. You could also bend the feed lips up a bit at the front. High Cal has started recommending shaving a tad off the bottom of the chamber to make a small feedramp of sorts. I've had a mixed bag with mine. Due to the manufacturing variances I've got 3 mags that feed fine and one that does exactly what your describing.
 
edojan said:
Interesting. There are two different styles of M4 ramps - with one or two groves. Which one do you have? Also, do you know if the barrel had to be removed in order to do this job or did he machined it without detaching it from the receiver?
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Two groove M4 feed ramps, barrel does not appear to have been removed and a milling machine would be able to machine the feed ramps with the bolt carrier/ect removed and milling downwards into the breech.

I did the milling on my rifle myself, other then a clean up on the bolt by HiCal and the closed bolt mod.
 
Grove said:
Two groove M4 feed ramps, barrel does not appear to have been removed and a milling machine would be able to machine the feed ramps with the bolt carrier/ect removed and milling downwards into the breech.

I did the milling on my rifle myself, other then a clean up on the bolt by HiCal and the closed bolt mod.
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A couple of pictures would be greatly appreciated. I have a milling machine and willing to give this a try. But I wonder about the grove sizes and the angles (what size of the end mill did you use - also I presume that you used a ball nose end mill?) and what were the angles at which the groves were milled with respect to a) the barrel and b) each other?
 
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