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Posted: 2/11/2013 4:33:39 AM EDT
We went to the range to shoot my new to me Colt M16 commando with 11.5 upper. The guns cycle rate was crazy fast with current 5.56 Xm193. It was running way to fast so I need to change the buffer and spring any suggestions? I do not know whats in the gun now because the transfer is not complete so I do not have possession yet. The gun is in great shape and not a worn out unit just worried that It could damage the gun on full auto. The gun is 100% all Colt too.
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Will it hurt the gun to run it that fast? I had a similar experience with the Colt M16 that I’m waiting for (any day now!).
With 55 grain Wolf and a standard buffer it ran fine, but with green tip (62gr?) it ran like my M11/nine. I bought an H2 and I guess I should buy an H3 after reading this post. Any other thoughts on the Enidine buffer? |
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If you are approaching 1000 rpm switching from a H2 to a H3 is not going to make a huge difference. The MGI and Enidine are much heavier, more expensive, but will bring the ROF down noticeably.
As I said earlier, if you use a rifle stock and buffer (the horror) you don't need a high-dollar RRB. I suppose my 16 does't look tacticool with rifle stock and 11.5" upper. I really don't care about looks. But it's your money, your call. One other thing comes to mind. As shortys get long on round count the gas port enlarges and gets ratty looking (elongated). That tends to increase ROF. You can see dropped extraction (need for a ring or X-power spring) due to overgassing. So..........were I to install a "new to me" (ie., used) shorty upper and discover it runs too fast I'd first be wondering about round count. Possibly the answer is a new bbl, and not a heavy buffer. So get a magnifier and look closely at the gas port, and at the throat. Sam ETA: John, yes too fast is bad. It reflects overcycling. This is hard on fcg parts, pins they move on, and maybe even the fcg holes in your RR. Also hard on bolts. If you even slightly feel trigger slap stop immediately. Do not make the mistake of simply installing KNS pins to deal with trigger slap. That's analagous to your wife using duct tape to hide the check oil light in your car. |
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First, I want to congratulate you on an absolutely gorgeous gun. Do not swap out the receiver extension if it is all factory.
I would start with an H2 and move up to an H3 if necessary. I shoot my Colt lowers with carbine receiver extensions, standard carbine action springs, H2 buffers, and 10.5 inch uppers from LMT and Noveske. I have found this to be the best setup for me with a nice slow controllable ROF (haven't clocked the actual number). Also use a new action spring, as you never know how many rounds yours has seen. |
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Thanks, the gun is an original 11.5 commando so that's why I chose to install a new factory Colt 11.5 upper, The gun is in fantastic shape with very little wear on the upper or body of gun. I am going to try the upper first with the buffer that is currently in the gun ,and I am trying to find Buffers and springs in stock but as everything else they are sold out. I had two mags with older .223 VS the 5.56 XM193 and the rate was fine with the .223 but seemed fast too. I just do not want to damage the gun ,so thanks to everyone for the help. I will report back as soon as my upper shows up and I can find buffers .
Thanks Mark |
| Here is a suppressed vid of my m16 with an enidine buffer. Look at the ROF on the meter. VID |
| What is realy need to control the ROF is a hammer retarder. This would help anyone with bolt bounce issues. If a retarder was used as a standard there wouldnt be any bounce issues in the m16 famliy. I have asked about one before, and no manufacture stepped up to the plate. It could be built alot like an ak's. |
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Get a MGI or Enidine buffer. I perfer the Enidine.  Funny I prefer the MGI... well to be fair my Enidine broke but it worked well until then. The LMT enhanced bolt carrier works a bit (increased dwell time). Tunable gas block helped a bit, tubbs flat wire buffer spring helped a bit. Tubbs also makes weight kit for your carrier which worked really well but I didn't like it. It felt like I was shooting in a row boat. |
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This is a video contest I entered for MGI. I really do love the MGI buffer Kind of expensive for what it is but it does work. The gun is a 10.5" chrome lined bore. Standard buffer spring and I am shooting wolf 55 FMJs.
Video |
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Where mdo you guys find those cyclic rate measures???????  Its called a shot timmer. Here is a link. |
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Where mdo you guys find those cyclic rate measures??????? Its called a shot timmer. Here is a link. I'm not sure about that shot timer, but this one has an actual Rate of Fire calculator mode (supposed to work better in really high ROF applications). Ya the pocket pro II does have the ROF count. Its what I use in my vid. Its a great timmer too! |
| Update!!! Just went to the range and changed out the upper out with a modern 11.5 Colt commando and added a new spring and H2 buffer,the rate of fire slowed down to acceptable rate,the gun is a lot easier to fire and saves a little ammo too. Now just need to wait till the transfer is complete. |
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Update!!! Just went to the range and changed out the upper out with a modern 11.5 Colt commando and added a new spring and H2 buffer,the rate of fire slowed down to acceptable rate,the gun is a lot easier to fire and saves a little ammo too. Now just need to wait till the transfer is complete. Nice, glad that worked for you. |
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