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col.1981
03-05-13, 22:40
Enlighten me on the difference between these two gas blocks. I've only saw the later with the 'closed front' I guess you would call it?

http://i111.photobucket.com/albums/n136/greenroundhill/file_zpsf380adee.jpg
http://i111.photobucket.com/albums/n136/greenroundhill/file_zpsa2127e09.jpg
m16
03-05-13, 23:17
Functionally there is no difference.

The BCM has a blind hole, the other one was drilled all the way through.
col.1981
03-06-13, 00:34
Functionally there is no difference.

The BCM has a blind hole, the other one was drilled all the way through.

The first one is BCM too, a 12.5" Kino.
The_Hammer_Man
03-06-13, 00:37
I'm guessing the drilled through gas block is from an older build. BCM started putting the star on theirs a while back (not sure when).

When I personally see that star on a gb I know, if there is a problem, it most likely won't be the gb.
m16
03-06-13, 00:44
Ah ok, I thought that first one was a YHM.

I've used both types, and there is no difference.
col.1981
03-06-13, 00:50
When I personally see that star on a gb I know, if there is a problem, it most likely won't be the gb.

Lol, is that a fact? Haha, I wasn't really talking about problems. Just trying to discern the differences (other than the obvious) in the two gas blocks. Why some are open and some closed, if one is more desirable than the other, or is just a matter a mfg process that doesn't make much difference.
Clint
03-06-13, 12:24
The through hole is easier to manufacture correctly and allows you to tap out a stuck gas tube.
The_Hammer_Man
03-06-13, 13:03
The through hole is easier to manufacture correctly and allows you to tap out a stuck gas tube.

+1 to the above. Anything that makes working on a rifle easier is a gooood thing in my book.
col.1981
03-06-13, 20:18
The through hole is easier to manufacture correctly and allows you to tap out a stuck gas tube.

Good info to know. Thank you sir for the input.