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NC,
Yes. It is a HK 416 Gas Block. It has the bayonet lug and sling swivels. It is easy to swap out with some basic hand tools and a vise helps. I removed my upper from lower, removed the charging handle, BCG group, front handguard, piston & piston rod assy. I then placed the barrel, behind the gas block, with wood blocks into my vise, muzzle pointed straight up, removed the flash suppressor & crush washer, used a hammer and punch of the right size to drive out the rolled spring pins.The pins are in there fairly well so this is why a vise helps. With out a vise I imagine it would be a pain in the neck and you will likely scratch something. Lubed the barrel up well in front of the gas block, gave it a slight tap and it came right off. Lubed up the new evil block where it slides on the barrel, worked it on by hand, reinstalled rolled spring pins and reinstalled the rest of the components.
At some point I would like to get IGF to reprofile to 14.5 and pin on an extended A2 but for now I'm happy with it.

TC
 

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Thanks TC! I love the MR556 but wasn't willing to have one without a bayonet lug. You never know when you gotta go medieval on the zombie horde. Time to give Adam a buzz!
 

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You never know when you gotta go medieval on the zombie horde.

That's what the Paul Chen Katana is for.


On topic, will the 416 gas block fit under the longer M27 length rail properly?
 

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It will. I had one on my factory 14.5" upper at one time and I believe Michael Vain still does on his 14.5"; he has pics of his floating around.

Mine from a while back:
Cool. Wasn't sure how the bayonet lug fit.

Nice stick too. Just out of curiosity, why did you remove the M27 rail?
 

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Cool. Wasn't sure how the bayonet lug fit.

Nice stick too. Just out of curiosity, why did you remove the M27 rail?
On both of my 416 uppers, the original handguard fits into place with little to no play even without the screw in place. With the longer rail, there was considerably more play, and I had to really tighten the mounting screw down to exceedingly tight levels to remove all play. Oddly enough, this issue only existed with the 416 uppers, but not the MR556 upper I had briefly. I felt that the rail offers an equally mixed bag of Pro's and Con's, but that was the primary reason. Well, that and it helped my MR upper fetch a decent price.
 

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Alright, so stupid question time....Will the HK 416 16" Gas Block - HKPARTS.NET work with the HK extended rails available for the MR556? What I am trying to get to is having a bayonet lug with the longer rail, basically like an M27 minus the happy switch. Make sense?
 

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Cool. Wasn't sure how the bayonet lug fit.

Nice stick too. Just out of curiosity, why did you remove the M27 rail?
On the M27, the gas-block bayo lug sits inside the hanguard so they've added a pin-on like they do on the full-length G36's.
 

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On the M27, the gas-block bayo lug sits inside the hanguard so they've added a pin-on like they do on the full-length G36's.
So it's not the same. You can have either longer rail or bayonet lug, but not both. Unless you do heavy mods vs. just part swapping.
 

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So it's not the same. You can have either longer rail or bayonet lug, but not both. Unless you do heavy mods vs. just part swapping.
Correct. Do a Google image search on M27 IAR and you see what I'm takling about. You can clearly see the gas block set back and the add-on bayo lug. There's a really good photo of it on the front of the 2012 calendar.
 

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Chops what is the odds of us (me) getting one of the adjustable gas blocks from a 416? I am assuming a armorer could order one as a replacement part?
 

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Correct. Do a Google image search on M27 IAR and you see what I'm takling about. You can clearly see the gas block set back and the add-on bayo lug. There's a really good photo of it on the front of the 2012 calendar.
That's what I thought from pics I've seen. Oh well, maybe I'll go SBR with it after all.
 

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Chops what is the odds of us (me) getting one of the adjustable gas blocks from a 416? I am assuming a armorer could order one as a replacement part?
This. I'd love to get my hands on the Norwegian AGR for my gun. I'd go so far as to drill out the weld on the flash hider to swap gas blocks and then re-pin and weld the hider back on for one of those.
 

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Chops what is the odds of us (me) getting one of the adjustable gas blocks from a 416? I am assuming a armorer could order one as a replacement part?
The U.S. 416 doesn't have an adjustable gas regulator. I know the 417 does but the 10.4 and 14.5 416's do not. I don't even think the 20" does either. I can't remember if the M27 does.

I'll see if Adam can get a part# for a foreign one but i bet the odds of getting it shipped here is bleak.
 

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The U.S. 416 doesn't have an adjustable gas regulator. I know the 417 does but the 10.4 and 14.5 416's do not. I don't even think the 20" does either. I can't remember if the M27 does.

I'll see if Adam can get a part# for a foreign one but i bet the odds of getting it shipped here is bleak.
No AGR on the M27
 

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The U.S. 416 doesn't have an adjustable gas regulator. I know the 417 does but the 10.4 and 14.5 416's do not. I don't even think the 20" does either. I can't remember if the M27 does.

I'll see if Adam can get a part# for a foreign one but i bet the odds of getting it shipped here is bleak.
I know of at least 5 he would off load, if that makes a difference.
 
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