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Kozzie · January 28th, 2011, 00:58

I have been looking for ICS compatible Sig mid caps for a while now but the only thing I have come across are other ICS Sig owners looking for the same thing. I remember reading in a thread once that it is somehow possible to modify TM compatible mags to fit the ICS so I got some to give it a try.

Here is how I moded midcap mags to fit and feed in the ICS Sig 55X. I hope that this thread will be useful to anyone who is in the same predicament I was.

This mod is very easy to do and should take you no more than 15 mins.

Found some Mag brand 100rnd mid caps http://www.airsoftparts.ca/store2/in...oducts_id=1065

This rather large and brutish metal file is the only tool I used, I would have preferred something smaller and more delicate but it was all I had.

Step 1: Modify what I will call the BB retention tab. If you look at the mag on the left you will notice a small flat spot on top of the tab, you'll need to file this flat spot away and "ramp" the tab so it resembles the one on the right. This is so the hop-up can properly push the tab aside and allow BB's to feed. Only remove as much material as you need to by testing it gently along the way, don't force it or you may ruin your hop-up. You'll know if you got it when the mag will insert all the way into the mag well, test it with some BB's loaded if a few fall out when you pull the mag away you're done.
Note that the mag will not yet "click" in place you will take care of this next.

Step 2: Ok now the mag is feeding and you want to get it locked into place. You need to remove material from what I will call the rear mag catch. If you look at the picture you'll see I have removed about 1mm of material from the catch. You want to take your time with this testing as you go, you can always file away more but you can't put it back on, everyone hates a wobbly mag. You also want to try to keep the filed surface as straight and as perpendicular to the mag as possible, this will minimize your mag wobble. You'll know you're done when... you guessed it you hear that sweet click and the mag locks into place. Again don't force it, if it's tough to get in take a little more off.

There's one more thing you should probably do and thats clean out the plastic filings from the mag. Turn it upside down and look for the the circular thumb screw. Turn it 90 degrees and pull it out along with the spring and spring guide, actually you're probably best off to have the spring out while performing step 1. Now be careful because the contents are under pressure and the guide may go flying across the room get lodged behind your couch and take you 15 mins to find. I mean.. I imagine that sort of thing could happen if you're not careful. Now blow out the mag using some compressed air, if you don't have any compressed air a long pipe cleaner will do. You may also chose to blow the filings out with your mouth but I would recommend against it as you will introduce moisture into the mag which can rust the spring. Reassemble and you're finished. You may chose to omit the spring guide when reassembling, this will allow you fit more BB's in the mag but may cause poor feeding as it will undermine the strength of the spring. I have not yet run the mag without the spring guide. You could also try to trim the guide and find to happy middle ground.

**Edit: I have run this modified mag through 20+ times now both on semi and full auto with zero feeding issues.**

Hope this helps you out enjoy!

Link

January 28th, 2011, 00:58	#1
Kozzie a.k.a. Greedy Trader rating Join Date: Dec 2010 Location: Toronto	MOD: ICS Sig Mid Caps I have been looking for ICS compatible Sig mid caps for a while now but the only thing I have come across are other ICS Sig owners looking for the same thing. I remember reading in a thread once that it is somehow possible to modify TM compatible mags to fit the ICS so I got some to give it a try. Here is how I moded midcap mags to fit and feed in the ICS Sig 55X. I hope that this thread will be useful to anyone who is in the same predicament I was. This mod is very easy to do and should take you no more than 15 mins. Found some Mag brand 100rnd mid caps http://www.airsoftparts.ca/store2/in...oducts_id=1065 This rather large and brutish metal file is the only tool I used, I would have preferred something smaller and more delicate but it was all I had. Step 1: Modify what I will call the BB retention tab. If you look at the mag on the left you will notice a small flat spot on top of the tab, you'll need to file this flat spot away and "ramp" the tab so it resembles the one on the right. This is so the hop-up can properly push the tab aside and allow BB's to feed. Only remove as much material as you need to by testing it gently along the way, don't force it or you may ruin your hop-up. You'll know if you got it when the mag will insert all the way into the mag well, test it with some BB's loaded if a few fall out when you pull the mag away you're done. Note that the mag will not yet "click" in place you will take care of this next. Step 2: Ok now the mag is feeding and you want to get it locked into place. You need to remove material from what I will call the rear mag catch. If you look at the picture you'll see I have removed about 1mm of material from the catch. You want to take your time with this testing as you go, you can always file away more but you can't put it back on, everyone hates a wobbly mag. You also want to try to keep the filed surface as straight and as perpendicular to the mag as possible, this will minimize your mag wobble. You'll know you're done when... you guessed it you hear that sweet click and the mag locks into place. Again don't force it, if it's tough to get in take a little more off. There's one more thing you should probably do and thats clean out the plastic filings from the mag. Turn it upside down and look for the the circular thumb screw. Turn it 90 degrees and pull it out along with the spring and spring guide, actually you're probably best off to have the spring out while performing step 1. Now be careful because the contents are under pressure and the guide may go flying across the room get lodged behind your couch and take you 15 mins to find. I mean.. I imagine that sort of thing could happen if you're not careful. Now blow out the mag using some compressed air, if you don't have any compressed air a long pipe cleaner will do. You may also chose to blow the filings out with your mouth but I would recommend against it as you will introduce moisture into the mag which can rust the spring. Reassemble and you're finished. You may chose to omit the spring guide when reassembling, this will allow you fit more BB's in the mag but may cause poor feeding as it will undermine the strength of the spring. I have not yet run the mag without the spring guide. You could also try to trim the guide and find to happy middle ground. Edit: I have run this modified mag through 20+ times now both on semi and full auto with zero feeding issues. Hope this helps you out enjoy! Link Last edited by Kozzie; December 7th, 2015 at 23:39..