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Gas blocks?
- Thread starter GunGrey
- Start date
I have the yhm ones, only I have the rail on the bottom and not the sling attachment. It is strong, no-nonsense, no-frills. Not the lightest in weight, but no issues at all with operation/function and it does offer the option for unobstructed optics if you want that.
Dave
Dave
GunGrey
Banned
I don't really want to run a rails because I don't have enough shit to put on them. The only thing I'm worried about is runnin the yhm with NonFF handguards an having to use the retaining cap.
I've found the yhm for a decent price and unjust wanted to get some feedback on them.
Why does this worry you?
GunGrey
Banned
I dont know if it should be a concern or im just being overly stupid
but the retaining ring is only held in place by the gas block right? Im worried about the gas block shifting forward due to the pressure on the retaining ring.
but the retaining ring is only held in place by the gas block right? Im worried about the gas block shifting forward due to the pressure on the retaining ring.
ChevyGuy91
NES Member
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- Mar 25, 2008
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OK, so I have a few minutes...
My first AR upper had the YHM folder you are asking about. What is nice about it is you don't have to worry about drilling and pinning the front sight to the barrel. I did not like the upper in it's original form, I wanted a long FF rail instead of the mid length rail I had, so I took a dremel to the sight portion and cut it up to fit under the new rail I bought. It still worked fine, just without the sight portion.
There should be no issue using a hand guard retaining cap, the only thing I will recomend is using loctite on the threads of the screws.
- - - Updated - - -
There is a spot machined on your barrel to catch the retaining cap, just slide it on, then install the gas block, easy peasy.
My first AR upper had the YHM folder you are asking about. What is nice about it is you don't have to worry about drilling and pinning the front sight to the barrel. I did not like the upper in it's original form, I wanted a long FF rail instead of the mid length rail I had, so I took a dremel to the sight portion and cut it up to fit under the new rail I bought. It still worked fine, just without the sight portion.
There should be no issue using a hand guard retaining cap, the only thing I will recomend is using loctite on the threads of the screws.
- - - Updated - - -
There is a spot machined on your barrel to catch the retaining cap, just slide it on, then install the gas block, easy peasy.
GunGrey
Banned
have you had it loosen?
Does it shift? say after a mag dump.
Have you dropped it/hit something with it and have it move?
ChevyGuy91
NES Member
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loctite the screws, I never had mine loosen. I never noticed it shift, however I rarely shot it with the iron sights, I was to cool for school with an EoTech. I shot probably close 3k through that upper with some form of the YHM gas block on the barrel, it was pretty legit.
GunGrey
Banned
good to know
I think im gonna buy it and use it till i stash away enough cash to get an aimpoint or another mircodot
GunGrey
Banned
ntomsw
Banned
Ahh ok. I had my gunsmith put 2 set screws in it.
GunGrey
Banned
yea i could do that too didnt even think of that
how much did the smith charge you for it ?
ntomsw
Banned
I had a couple of other things done too. If it was just the 2 set screws, maybe $50. Not even.
It was my 1st build. So he installed the barrel, tightened down my barrel nut, installed the gas tube, installed the F marked FSB, and put the 2 set screws in for $75.
So if it was just the 2 set screws, maybe $40? Not sure. If you want his info let me know. I'll send you a PM. Kind of far from you, but he dopes excellent work.
Last edited:
GunGrey
Banned
Kinda like this?
Front Sight Assembly, "F" Marked, Set Screw Base, .750 Barrel Dia.
of course id have to yank the bayo lug
Front Sight Assembly, "F" Marked, Set Screw Base, .750 Barrel Dia.
of course id have to yank the bayo lug
ntomsw
Banned
Kinda like this?
Front Sight Assembly, "F" Marked, Set Screw Base, .750 Barrel Dia.
of course id have to yank the bayo lug
Bingo.
With that installed with a couple of set screws, you can bash it off the floor, and you never need to worry about it moving or shifting.
KMM696
NES Member
I have seen one of the YHM clamp on gas block/sights shift, on one of MassMarks rifles. It had run without issues for what I'd estimate to be 1k rounds, and then abruptly developed a POI shift and FTF/FTE problems. The gas system on that upper had other issues that were pushing it towards failure, so the gas block shifting was the last straw, not the total cause of the FTFs. The undersized gas tube and a gas port that hadn't been opened up when the barrel had been cut shared the blame for those.
Since we were committed to a clamp on style because of the permanent brake, and I wasn't interested in determining if the barrel or gas block was out of round, or burred, or just had some ugly tolerance stacking, I taper pinned it on after realigning the sight and finding the right gas port size. No problems since. I did lose a little faith in the clamp on sights in the process, but I wouldn't say that one failure on one rifle makes them suspect.
Since we were committed to a clamp on style because of the permanent brake, and I wasn't interested in determining if the barrel or gas block was out of round, or burred, or just had some ugly tolerance stacking, I taper pinned it on after realigning the sight and finding the right gas port size. No problems since. I did lose a little faith in the clamp on sights in the process, but I wouldn't say that one failure on one rifle makes them suspect.
I've done a couple of builds with those Armalite A2 style clamp on gas blocks / sights. Torqued the bolts to 35 in-lbs (in sequence, tighten one, then the other, at a given torque setting until they both click, increase torque, etc.). It's not gonna budge.
