sideshow99

thanks, good to know I'm not crazy. :o

I can't put push-pin sling adapters in there, nor screw-in swivel studs like on the RRA rails, so what are they for?? thanks

hmm.. good question, it was so long ago I don't remember. I think I just eyeballed it. I did follow cootercustoms initial thread (linked in that post) and built on it. The advantage of this mod is that you can screw up your SEF (airsoft) lower and not ruin your gun or be out a lot of money--heck even a new trigger pack is relatively cheap. I even bought 2 levers and SEF lowers to play around with. This is the best mod I've done to my GSG and highly recommend. It's fun to do and you will be rewarded with the best looking .22 at the range. Try it man, try it!

yes, I posted the how-to guide here: http://www.ar15.com/archive/topic.html?b=6&f=41&t=322967

Update, a buddy let me shoot some of his RWS subsonics and at first the ejected casings were getting caught shut in the bolt, so I loosened the spring nut to be flush with the receiver. Cycle improved but we still got a casing caught in the bolt about every 5 rounds. Loosed the nut as far back as it would go without blocking upper from closing on the lower and fired a magful without issues. So while the Rem subsonic was too powerful, this RWS seems to be on the opposite end. I'll try some winchester next and see if it's in the middle.

thanks, I should have mentioned the ammo. It's Remington Subsonic hollow point. It's very dirty but it cycles great on my GSG-5 suppressed. I'll try the Winchester and report back.

I looked all over the web on a guide for cleaning the bolt but they all stopped just short of it. The bolt gets filthy and in my case was resulting in light primer strikes. Here are the steps I took. Disclaimer: for informational purposes only, follow at your own risk. DISASSEMBLY 1. Start by punching out the roll pin. It's awkwardly placed, but it will come out, you may need a small punch since you are coming at it at an angle. Remember which position the tapered pin goes. 2. Pry open the bolt using your hands first then a screwdriver. It's tight but gently pry back and forth from each side and it will open. Watch for the springs inside as they can fly out. 3. Clean and polish all the parts, specially the firing pin and extractor. I use the wife's Walmart nail files. before after 4. Remove the firing pin spring, it's stuck in there tight, so I used a small punch. One side of the bolt is wider so play around until it comes loose, don't force anything! At this point you can do wobblinwheel's mod and remove a loop (or two) from the firing pin spring, this is supposed to reduce light primer strikes. Do this at your own risk as this could result in slamfires and other nasty things. You can also stretch the extraction spring for improved manual extractions. 5. Thoroughly clean and polish the bolt. I use a microfiber towel and wedge it in the firing pin channel and rub it back and forth REASSEMBLY 6. Now comes the fun part: The extractor spring needs to go back in. It only goes in one way, so it's hard to get it wrong, but if you thought the mag catch spring was tough, wait till you see this! You will need to keep the spring in place while putting the 2 bolt halves together. USe your hands only, don't hammer or tap the bolt together. 7. Test the firing pin and extractors for proper function then replace the roll pin in the same direction it came out. Your gun should now be almost as reliable as the day you bought it :thumb:

I've had my Colt m4 for about a year now and it run great, no issues. I do a deep clean per this forum every 1k rounds. Recently I got a suppressor and getting all kinds of jams. I can't get through 3 shots without a problem. Mainly the bolt doesn't seem to close back into battery after firing and when it does, I get light primer strikes. I've tried adjusting the spring tension all the way in, out, and in between and no effect. I realize the can is creating more gas pressure on the battery but not sure how to fix. I'd really like to shoot suppressed with this gun, anyone else having this problem? ideas on how to fix? many thanks