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Posted: 2/17/2006 5:11:24 PM EDT
[#1]
Are you 100% sure your gas tube is oriented correctly... with the gas port down, and the roll pin hole correctly aligned? With the roll pin removed, you should be able to see a clean hole through the FSB, through the gas tube roll pin hole, and out the other side. This must be visually lined up before attempting to install the roll pin. If it still hangs up, insert from the other side, just in case there is a bur on one side (highly doubtful) Make sure you are using the correct roll pin size.... The roll pin does not need full insertion to make the gun run... so that fact you arent cycling, tells me you got the tube oriented wrong, or some trash keeping you from aligning it properly. |
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Posted: 2/17/2006 5:42:37 PM EDT
[#2]
Falarak:
the tube is oriented properly. I can put a 1/16 drift through, all lines up very well. I don't understand what can be failing to line up. the gun cycles well half the time and the case is ejected. sometimes the case hangs up. I visually saw soot around the front site base. I figure there is not enough gas going through. hey, I am all ears. bill d |
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Posted: 2/17/2006 5:55:53 PM EDT
[#3]
Well... if you can easily get a 1/16" drift in, you should be able to get a 5/64" roll in installed. If the gun now cycles half the time.... I might assume the barrel chosen has an issue.... with the chamber, or gas port. Who made the new barrel? Visual soot around FSB is normal... you will get some blow by and it will self-seal completely eventually. This new barrel, did it come with a preinstalled FSB? Give us more details. |
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Posted: 2/17/2006 6:12:07 PM EDT
[#4]
FAL:
the upper is a BushM, the barrel is a DPMS DCM model, 20 inch. The front site base came with the DPMS barrel and it has the 4 adjustable set screws for windage for the mech zero. Can't I just stick something else other than a 5/64 roll pin? I am thinking I am losing gas, maybe there are other problems? Fal, you sound knowledgeable, what gives? billy |
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Posted: 2/17/2006 6:16:14 PM EDT
[#5]
It is possible that FSB is out of spec. Wouldn't be the first time I saw a DPMS cast part totally off.
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Posted: 2/17/2006 7:07:55 PM EDT
[#6]
I've had the same problem. To solve this, put a chamfer on both ends of the roll pin. Does not take much, chamfer the end until you have a nice fully rounded edge. The chamfered end will match up and slide into the opposite side hole easier. Lube the pin well, use a roll pin starter. I first had this problem with the rear sight pin not wanting to go into the opposite side hole. Now I chamfer all of my roll pins. Hope this works for you.
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Posted: 2/17/2006 7:22:41 PM EDT
[#7]
I use a small C clamp to push roll pins in with. I have also used channel lock pliers also to squeeze pins in.
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Posted: 2/18/2006 5:50:45 PM EDT
[#8]
Where is a good place to get a couple of spare roll pins without paying $5 for shipping?
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Posted: 2/18/2006 6:24:32 PM EDT
[#9]
www.midwayusa.com will ship light stuff USPS first class which is pretty cheap. My last order was $3 for shipping some pins and a carbine recoil spring. Basic roll pins are about $1 each. You can get a shipping cost in the shopping cart. |
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Posted: 2/18/2006 6:31:08 PM EDT
[#10]
holly mackeral... I just came up from pounding in a pin and same problem, wouldn't go all the way through. So that's the way it's staying for now.....
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Posted: 2/18/2006 9:50:52 PM EDT
[#11]
I had trouble today with the same thing. My solution was a brass punch small enought to line the hole up better. Too many times I was trying to put the pin in at an angle obviously that did not work.
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Posted: 2/18/2006 11:15:27 PM EDT
[#12]
Chuck the roll pin up in a drill and spin stone bevel the leading edge/tip of the roll pin. This allows the roll pin tip to glide threw without binding on the opposing edge.
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Posted: 2/19/2006 2:27:23 AM EDT
[#13]
I took the site base off the barrel and found that the two holes for the roll pin were not lined up!! I spent quite some time with this and I am not a happy camper! However, I put the tube in the fsb and cleaned it up with a 5/64 drill bit and the roll pin went in nicely. Alignment is important; however, the item needs to be drilled properly by the manufacturer!
Soon as I can, I'll head to the range and sight her in. PIA to say the least! everyone's help is appreciated. billy |
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Posted: 2/19/2006 3:50:28 AM EDT
[#14]
I put a small chamfer on one end of the gas tube roll pin. I usually have Mike do this on 50 of them at a time and we keep them in the parts box. I always check tube alignment with a 1/16" roll pin punch before trying to insert the pin.
I have seen misaligned pin holes before. You can check for it by inserting the roll pin punch and then looking to see if the punch is level by looking down the lenght of the barrel. These can be corrected but the chamfer usually allows the roll pin to seat. Denny |
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