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Posted: 2/13/2020 4:45:02 PM EDT
So I got my FN barrel, and I don’t know if it is slightly larger or has to much coating on it? I can not get my gas block to slide onto the barrel where it’s stepped up slightly where the gas block goes. I have tried both a Geissele has block and a Daniel Defense MK12. I have even tried lapping the inside of the Geissele gas block. I tried both gas blocks on a Colt and DD barrel and they slip on. Question is what is the secret? I have never had this issue before and I don’t want to try a little love on the gas block as it won’t ever come off short of a BFH. I’ve even cleaned the preservant off the barrel.
Thanks in advance!  Attached File Attached File |
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Posted: 2/13/2020 4:50:26 PM EDT
[#1]
Please forgive me if this is stating the obvious (one never knows), but did you lube the shit out of the barrel and try to tap the GB on with a brass hammer?
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Posted: 2/13/2020 5:05:11 PM EDT
[#2]
Quote HistoryQuoted:
Please forgive me if this is stating the obvious (one never knows), but did you lube the shit out of the barrel and try to tap the GB on with a brass hammer? |
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Posted: 2/13/2020 5:20:47 PM EDT
[#3]
Try heating it the gas block.
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Posted: 2/13/2020 5:55:32 PM EDT
[#4]
Quote HistoryQuoted:
Yes, I did. I ended up tapping it back off as I was nervous it was not going to come off. I used Lucas extreme weapons lube, should I use grease or something else instead? I used a high quality oil (vice grease) each time. |
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Posted: 2/13/2020 5:58:35 PM EDT
[#5]
Put the barrel in the freezer for 3 hrs,, put the GB in a pan on the stove and heat it up for 10 minutes. Side them together
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Posted: 2/13/2020 6:01:56 PM EDT
[#6]
Quote HistoryQuoted:
Put the barrel in the freezer for 3 hrs,, put the GB in a pan on the stove and heat it up for 10 minutes. Side them together |
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Posted: 2/13/2020 6:02:55 PM EDT
[#7]
Quote HistoryQuoted:
Try heating it the gas block. If you have a small propane torch, heat the gas block and use a mallet to tap the gas block on. Just remember to get it straight before it cools. If this doesn't work than one or both of your parts are out of spec. |
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Posted: 2/13/2020 6:34:04 PM EDT
[#8]
Quote HistoryQuoted:
Or in the oven. Quote HistoryQuoted:
Quoted:
Put the barrel in the freezer for 3 hrs,, put the GB in a pan on the stove and heat it up for 10 minutes. Side them together My finished product. 
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Posted: 2/13/2020 7:25:27 PM EDT
[#9]
Freezer and oven. I almost guarantee it will slip right on.
Edit to add: I put my small parts in a toaster oven in my garage for 10 min on like 250* and the larger piece in the deep freeze for a couple hours. |
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Posted: 2/13/2020 7:50:11 PM EDT
[#10]
Quote HistoryQuoted:
Try heating it the gas block. |
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Posted: 2/13/2020 8:13:41 PM EDT
[#11]
After removing/adding a gas block on an AK, this sounds like easy work
Put oil on the gas block area on the barrel, heat up the gas block so the metal expands and tap it on with a non marring mallet. It should go on without any issues. In my case I used a BFH and 3/4" brass rod that was about a foot long. A press fit isn't a bad thing |
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Posted: 2/13/2020 9:13:17 PM EDT
[#12]
When building my Mod 2 at Hodge Defense, we dressed the inside of the gas block by using a drill type tool with a soft buffer attachment, and then the gas block (SLR) could be tapped on with a plastic mallet and some CLP. It is a very tight fit. Which is a good thing. My Daniel Defense setups, as you say, were more of a slip fit. They worked okay, too, but tighter is better in this case.
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Posted: 2/13/2020 9:51:35 PM EDT
[#13]
Quote HistoryQuoted:
When building my Mod 2 at Hodge Defense, we dressed the inside of the gas block by using a drill type tool with a soft buffer attachment, and then the gas block (SLR) could be tapped on with a plastic mallet and some CLP. It is a very tight fit. Which is a good thing. My Daniel Defense setups, as you say, were more of a slip fit. They worked okay, too, but tighter is better in this case. |
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Posted: 2/13/2020 11:20:25 PM EDT
[#14]
Quote HistoryQuoted: When assembling my Hodge FN barrel and SLR gas block I used a propane torch to heat the gas block up and it went right on, I also used this method to fit the barrel to the receiver. Worked perfectly. |
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