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Posted: 4/30/2008 4:29:16 PM EDT
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Has anybody tried Quarterbore's theory on his website about modding a semi FCG to allow select fire with an RLL? I know Scott Bell sells modded M16 burst FCG's to allow the RLL to be select fire, but it is very expensive. I think I will take a couple of my semi FCG's over to a machinist friend of mine and see what we can work up. |
| check out www.m60joe.com/ I think he can convert or make the select fire parts for you. |
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ETA: to answer your original question: No I have not tried the semi FCG select fire mod. but.... Select fire is incredibly easy and you can do it yourself. Get a M16A2 FCG. Toss the burst cam and burst cam spring. Cut the hook off of the hammer. Take the burst disconnector (the one with 2 disconnects) and file/cut off the forward part of it (the part that would engage with the burst cam). Install and enjoy select fire capabilities with your RLL. If you need pics I'll get some for you. In this video my buddy is shooting my 9mm AR with RLL. It has a modified M16A2 FCG that I made just as above. The first couple shots are on semi. You can see him switch the selector to the "happy position" and he lets off a couple bursts. ETA: there was a guy selling M16A2 FCGs here on the EE but I haven't looked in a while. IIRC I paid $15 for each FCG. Magoo |
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I have never tried the semi modification so I can’t answer that. I make my own select fire from the burst kit. Get parts from bushmaster or brownells; I don’t use the complete kit, only the burst trigger and disconnectors and selector. The stock semi DPMS hammer works perfect and I install a regular M16 hammer spring. It’s very easy to do the only thing I would definitely suggest even if you purchase one is to perform a safety function check before using. I will try to expand on why I say that. I’m not very good at internet communication. The kit that came with my link *I don’t know who made it* had a dangerous problem it would some times fire when you let go of the trigger in the full auto position. It was made from a complete burst pack m16 hammer and all. What I found was when the trigger was held back and the hammer was reset *held by the r/side disconnector* if you let off the trigger very slow the hammer would drop before the trigger could catch and stop it. **Hold hand infront of hammer so hammer will not drop and damage receiver when testing.** The problem was the r/side disconnector hammer catch was set back to far causing it to release the hammer to soon. I have found the same thing with all the new ones I have assembled. You need to remove some metal from under the front right side disconnector to trigger contact area to adjust. If the parts are new it may pass the test but with some wear it may start to fail. Basically I even out the disconnectors hammer catch area looking down into the receiver so the right side is the same as the left. Sorry if I gave any one a headache but I felt what I found was worth passing on. |
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I have tried it and could not get it to work reliably. I think it is possible but other projects took me in different directions. Modded several FA fire control groups from 16 parts as mentioned above and they work fine. I would like to perfect the AR parts select fire upgrade if for nothing else to not have any M16 parts in the ARs...but I just can't get the &$&^#$ thing to work consistently. It should but it dont! One day I'll work it out and post but it will be a while in the future! Now on M-11 mods! Anybody got ideas on a double feed system like Richard Lage??? FH |
Good Luck and have fun! FH |
Hmm... I never noticed that before (cutting a notch into the disconnector). All of my select fire mods have worked thus far, for the most part. Interesting. After looking at it I see how it works. Sometimes my 5.56 hosts will fire a burst in semi... I always thought it was something to do with timing... Now i see the light. Thanks for pointing that out!!! |
Thanks for the pic! If you notice the upper disconnector has the front hook completely cut off (don't use the 3 rnd burst cam so not needed). Also - you have to look real close but the bottom disconnector has been milled back about a millimeter so the link will run free. I played with mine using a dremel until I had it notched out just right. My notch was only about 2 mm wide where m60joe has his the entire length of the disconnector so it is hard to see. If you look on quarterbores site you will see how I notched mine. The AR mod does the same with the single disconnector but uses the safety to rotate the link up just a hair so it will meet the notch just right...I just never could get it to reliably hit the notch - kept bouncing from SA to FA or just stop in mid-burst... Someday!!! FH |
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Thanks guys. I have converted a few M16 fcg's to work with the RLL, however, I am wanting to get the semi fcg's to work for two reasons: 1. semi fcg's are less expensive than m16 fcg's 2. I would have no full auto m16 fcg parts in my lower for the JBT to bitch about |
Just to clarify an important part of the mod. Quarterbore has some good information on his site:Quarterbore's LL site He is mistaken in crediting Scott Bell with inventing the M16A2 based RLL select-fire kit. Scott listened to me blab the full description of my idea, excused himself from the conversation, and ran straight over to John Norrell's house with "his" idea. I found out about it about a week later, after the other person in the conversation let me know Scott had bragged to him about taking the idea to John. When I came up with the idea, I envisioned sharing it with the NFA enthusiasts' community as a DIY project, not as a money making idea. Karl |
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I'm not looking to rain on anyone's parade but, it is my understanding that whether you use M16 modified parts or modified AR-15 parts, the parts are "designed to convert". To me the biggest issue would be if, without the registered conversion part (LL or DIAS) that the host firearm could fire more than one round with one pull of the trigger. When I pull my DIAS out of a lower, I replace the FA selector with a semi selector. I like to use the JP Enterprise"s trigger. The trigger is setup for a specific hammer. It would be a real PITA to have two different complete fire control sets for each lower. With a semi selector the hammer will only drop once per trigger pull. Yes I understand that ATF doesn't want any full auto parts in a semi lower. To me the big issue would be noting to hold the hammer back (slam fire). If the host firearm can't fire more than one round per trigger pull than by definition it is not a machinegun. I'm just setting up my LL. It seems to me the modified burst kit would be the easier way to go. There are some really great info and pics in this thread. Thanks for the input. Scott |
| I’m not concerned at all with the modified burst kit in my lowers. After the modifications all you have is a 2 position semi. Mechanically operating the same as a stock semi and would be no easier to make fire, or I should say slam fire more thin 1 round per trigger pull. |
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