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Posted: 9/2/2013 8:43:16 PM EDT
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Tonight I decided to switch from a fixed stock to a m4 on my colt. I found that somebody had been using a carbine buffer and spring in a rifle length tube. Regardless of the upper used (suppressed or not) it had a nice slow rate of fire with that setup.
http://www.youtube.com/watch?v=pTLapNnqPLg If I would use a rifle spring and buffer would I get a slower rate of fire than the carbine spring and buffer? What's the best combination for a slow rate of fire with a m4 buffer? I have unmarked buffers, a H2, and a 9mm buffer. |
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Running a carbine length spring and buffer in a rifle length extension tube is not good. The bolt group can travel too far rearward and smack the gas key into the receiver, causing broken/cracked receiver.
Heavier buffers in the carbine receiver extension could slow the ROF, but you could loose reliability, depending on the ammunition used. Running a rifle receiver extension and rifle buffer will be a smooth set-up. |
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You sound like a good candidate for the Vltor A5 buffer tube.
The length is between a carbine tube and rifle tube. It uses a rifle length spring but a proprietary length buffer. You can read more about it here: http://vltor.com/emod-a5.html Below is a picture I took to compare some configs. First one is an Enidine hydraulic in a Shrike spring and a custom plug on the other end to be used in an A5 tube. So the carrier can't bottom out on the receiver as previously mentioned. In the middle is a stock Vltor A5 buffer and spring. On the bottom is standard carbine buffer and spring for comparison. Your gas port size is also the big variable here that will affect your RoF. Contact me if you want any more info. 
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