User Panel
User Panel
User Panel
|
Posted: 12/24/2020 4:53:36 PM EDT
[#1]
More and more gas blocks are being made that install against the shoulder. If yours is the low profile set screw YHM-9383, it installs against the shoulder, all other YHM do not.
|
|
|
|
Posted: 12/24/2020 5:29:07 PM EDT
[#2]
Yes, that is the gas block that I have.
Ok, that then explains my issue. Is there some where I can determine which gas block will work with Handguards? |
|
|
|
Posted: 12/24/2020 6:19:22 PM EDT
[#3]
Quote HistoryQuoted: Yes, that is the gas block that I have. Ok, that then explains my issue. Is there some where I can determine which gas block will work with Handguards? Thats the problem, the vendors dont bother to tell you if the gas block mounts flush against the shoulder or uses a handguard cap gap. I just bought 2 new Colts with shaved front sight gas blocks installed by Colt, they put a spacer ring in place of the handguard cap. I have used that Yankee hill version, its design to mount flush to the shoulder. The easiest way to tell is to install gas block upside down and look thru the set screw hole. Its a crap shoot when you buy a gas block as to whether its designed to mount flush to the shoulder of the barrel or have the "gap". I have no idea why they dont or cant mark that on the package. It would be helpful to know this online before ordering. |
|
|
|
Posted: 12/24/2020 6:53:42 PM EDT
[#4]
What we teach in Armorer courses is to use a gas block alignment fixture, as this gets the gas block properly aligned over the gas port on the barrel with no guess work. The sharp point on the indexing screw goes into the gas port, then you can use the holes the other side of the fixture as a guide to drill dimples into your barrel. If the gas block set screw spacing is different from the indexing fixture dimpling hole spacing, then only use the dimpling hole that is directly across from the indexing screw as it is directly across from the gas port of which will be the same as the rear set screw on your gas block.
   CY6 Greg Sullivan "Sully" SLR15 Rifles TheDefensiveEdge.com (763) 712-0123 |
|
|
|
Posted: 12/24/2020 6:59:06 PM EDT
[#5]
I agree with you OTDR that the manufacture should identify if the block goes against the journal or not.
Sully I only have three (3) AR and two of them are already setup for handguard I just can't justify the cost to purchase the jig for drilling a dimple. |
|
|
|
Posted: 12/24/2020 9:55:20 PM EDT
[#6]
Most gas blocks are still allowing space for a handguard cap (0.025"-0.035"), Aero for example. I personally like one dimple only for free floats and no dimple for drop-ins. There is some leeway in gas port/gas block passage alignment that can help in keeping the handguard cap from flopping around. Also, not all caps are the same thickness. I've found a few tricks that's help me.
|
|
|
|
Posted: 12/26/2020 6:53:31 PM EDT
[#7]
Quote HistoryQuoted: I agree with you OTDR that the manufacture should identify if the block goes against the journal or not. Sully I only have three (3) AR and two of them are already setup for handguard I just can't justify the cost to purchase the jig for drilling a dimple. I would not rely an if a gas block does or doesn't butt up against any type of a shoulder on the barrel for a handguard cap, or if there is supposed to be space for a handguard cap, as this dimension depends upon what the machinist did when they profiled the barrel, and on occasion we see barrels with no shoulder on them. Gas block dimensions can also vary between manufacturers, and sometimes we see lack of consistency from some makers gas blocks where the dimensions have changed from one gas block to another. The one thing that is consistent on gas blocks is that the screw that is directly across from the gas port was put there during the machining phase to get the gas port in the gas block, so a gas block alignment/dimpling fixture will help you get a gas block centered over the gas port with no guess work. CY6 Greg Sullivan "Sully" SLR15 Rifles TheDefensiveEdge.com (763) 712-0123 |
|
|
|
Posted: 1/2/2021 9:42:42 PM EDT
[#8]
I assembled my rifle using the original gas block but without using handguard.
No special jigs needed. I installed the Diamond Head rail that I had on another rifle and it functions like it suppose to now. Dam manufacture changing things without notifying is for the birds. |
|
|
Win a FREE Membership!
Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. One new winner* is announced every week!
You will receive an email every Friday morning featuring the latest chatter from the hottest topics, breaking news surrounding legislation, as well as exclusive deals only available to ARFCOM email subscribers.
AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types.
From hunters and military members, to competition shooters and general firearm enthusiasts, we welcome anyone who values and respects the way of the firearm.
Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Industry Partners, and more.
Copyright © 1996-2024 AR15.COM LLC. All Rights Reserved.
Any use of this content without express written consent is prohibited.
AR15.Com reserves the right to overwrite or replace any affiliate, commercial, or monetizable links, posted by users, with our own.
