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+--- Thread: Designing a Grendel IAR (/showthread.php?tid=8285)
Designing a Grendel IAR - stanc - 09-04-2014
A photo posted on arfcom got me to thinking about this subject, which had been discussed on the old forum. As I recall, Variable was interested in making a Grendelized version of the Colt LMG (below).
![[Image: 1-3.jpg]](http://i33.photobucket.com/albums/d94/markgor08/1-3.jpg)
Since the unique handguard of the Colt weapon is quite hard to find these days, I'm wondering what might be the best alternative fore end to use on a Grendel IAR. Opinions?
The Seekins SP3R looks to me like it might be a good choice, but perhaps there are better alternatives?
![[Image: 7715998266_3c8937b2a4_z.jpg]](https://c2.staticflickr.com/8/7279/7715998266_3c8937b2a4_z.jpg)
Designing a Grendel IAR - am4966 - 09-04-2014
The seekins or diamondhead vrs t, but i can't tell how much you can mount to the diamondhead. M27 in 6.5 Grendel would take that platform to another level and truly give or troops a superior upgrade.
Imo
Designing a Grendel IAR - pinetreebbs - 09-04-2014
MagPul MOE?
![[Image: 745421.jpg]](http://media.midwayusa.com/productimages/2200x1650/Primary/745/745421.jpg)
Designing a Grendel IAR - usar_ds - 09-05-2014
personaly if i was going to build a grendel IAR i would go more with something more like this
https://www.mgi-military.com/store/index.php?product_id=38&type=&category=11
for quick change barrels like the M249
you could also mate it to a long stoke piston system so you wouldnt have to worry about accidentally bending gas tubes or moving parts attached to each spare barrel
maybe with something like this?
http://primaryweapons.com/firearms/mk1/piston/#.VAkZ9fldW9Q
but thats just what I would do
Designing a Grendel IAR - usar_ds - 09-06-2014
What barrel length were you thinking?
Designing a Grendel IAR - Variable - 09-06-2014
I don't know Stan, that's a good question. I haven't been shopping enough lately.
I like the idea of the aluminum heat sink Colt was playing with. If it worked well, I'd go with a finned sink on an 18" hammer forged 4150CMV barrel from FN with SAW chrome. I'd make the barrel around 1.1" diameter at the chamber and just step it down slightly for the sink. I'd go with a .963" gas block and ream it for an LMG gas tube. I guess I'd have to know how much clearance the heat sink would need, and go from there.
If the barrel were intended for .gov (and considering the depth of their pockets...), I'd spring for a stellite liner and call it good.
Designing a Grendel IAR - usar_ds - 09-06-2014
Variable Wrote:I don't know Stan, that's a good question. I haven't been shopping enough lately.
I like the idea of the aluminum heat sink Colt was playing with. If it worked well, I'd go with a finned sink on an 18" hammer forged 4150CMV barrel from FN with SAW chrome. I'd make the barrel around 1.1" diameter at the chamber and just step it down slightly for the sink. I'd go with a .963" gas block and ream it for an LMG gas tube. I guess I'd have to know how much clearance the heat sink would need, and go from there.
If the barrel were intended for .gov (and considering the depth of their pockets...), I'd spring for a stellite liner and call it good.
who is stan??
Designing a Grendel IAR - Variable - 09-06-2014
Here's an old pic under the handguard of mine.
![[Image: ColtLMG3.jpg]](http://i307.photobucket.com/albums/nn291/Variable556/ColtLMG3.jpg)
I'd ditch the grip and carry handle (they could be mounted to the new handguard's rail if/as desired).
Designing a Grendel IAR - Variable - 09-06-2014
usar_ds Wrote:who is stan??
Sorry, Stan is "stanc" who started this thread. He wrote some really great articles you may have read and his name (since it's already public-- I wouldn't "out" him otherwise...) is Stan Crist.
He's a pretty swell feller.
We get irked at some of the positions he takes sometimes, but he certainly helps keep everybody honest. 
ETA: with a re-read I can see where you probably thought I was replying to you and calling you Stan.LOL I should have worded it better.
Designing a Grendel IAR - usar_ds - 09-06-2014
Variable Wrote:Sorry, Stan is "stanc" who started this thread. He wrote some really great articles you may have read and his name (since it's already public-- I wouldn't "out" him otherwise...) is Stan Crist.
He's a pretty swell feller.
ETA: with a re-read I can see where you probably thought I was replying to you and calling you Stan.LOL I should have worded it better.
ohh, my bad, i guess it was me that was confused. lol
i have been reading up on the general dynamics .338 norma mag beltfed MMG lately, and been thinking alot about how it needs a 6.5 gren SAW lil brother.
it will be interesting if anyone with a sear actually makes a dedicated one, and what direction they end up going with it.
Designing a Grendel IAR - stanc - 09-06-2014
am4966 Wrote:M27 in 6.5 Grendel would take that platform to another level and truly give or troops a superior upgrade.Yeah, that's kinda my thinking, too. Plus, it'd be a helluva lot easier and cheaper for a Horde member to build a magazine-fed Grendel IAR than a belt-fed Grendel LMG.
Designing a Grendel IAR - stanc - 09-06-2014
pinetreebbs Wrote:MagPul MOE?A possible candidate. Thanks.
Designing a Grendel IAR - stanc - 09-06-2014
usar_ds Wrote:personaly if i was going to build a grendel IAR i would go more with something more like thisQuick change barrel. I like it.
https://www.mgi-military.com/store/index.php?product_id=38&type=&category=11
Designing a Grendel IAR - stanc - 09-06-2014
usar_ds Wrote:What barrel length were you thinking?16.5 inches, because that's the barrel length of the M27 IAR, Mk46 LMG, and LSAT LMG.
Perhaps also plan for a 12.5-inch barrel version, due to that length being used on a CQB variant of the LSAT prototype made for SOCOM.
Designing a Grendel IAR - stanc - 09-06-2014
Variable Wrote:I like the idea of the aluminum heat sink Colt was playing with. If it worked well, I'd go with a finned sink on an 18" hammer forged 4150CMV barrel from FN with SAW chrome.I think an aluminum heat sink is an interesting approach. Could possibly be a very good idea.
Designing a Grendel IAR - usar_ds - 09-06-2014
stanc Wrote:16.5 inches, because that's the barrel length of the M27 IAR, Mk46 LMG, and LSAT LMG.
Perhaps also plan for a 12.5-inch barrel version, due to that length being used on a CQB variant of the LSAT prototype made for SOCOM.
nice!
Designing a Grendel IAR - stanc - 09-06-2014
Variable Wrote:Sorry, Stan is "stanc" who started this thread. He wrote some really great articles you may have read and his name (since it's already public-- I wouldn't "out" him otherwise...) is Stan Crist.ARRGH! I was trying to keep it a secret! Sheesh!
Quote:He's a pretty swell feller.Ha! Got you fooled, too, eh? :o
Quote:We get irked at some of the positions he takes sometimes, but he certainly helps keep everybody honest.I keep trying to reform, but you know what they say about old dogs and new tricks.
Designing a Grendel IAR - Variable - 09-06-2014
usar_ds Wrote:ohh, my bad, i guess it was me that was confused. lol
i have been reading up on the general dynamics .338 norma mag beltfed MMG lately, and been thinking alot about how it needs a 6.5 gren SAW lil brother.
it will be interesting if anyone with a sear actually makes a dedicated one, and what direction they end up going with it.
I'd love to have a Grendel conversion for my Shrike, but since it took almost a decade to get it in 5.56.....
There is a guy in this thread over on Arfcom who is getting ready to run Grendel in his SAW.
http://www.ar15.com/forums/t_6_24/362809_M249_SAR_Project.html&page=9
To run 6.5 Grendel in a beltfed there are currently two hurtles, both of which are link related.
1.) You need to use Russki non-disintegrating links ala RPD style, and use an appropriate belt feed mechanism to handle them.
or
2.) Someone would have to actually manufacture disintegrating links for the 6.5 Grendel cartridge.
The number 2 option has never been actually explored to my knowledge. The standard M27 link won't play well with the Grendel cartridge in it's current geometry. Remember I said above that Stan sometimes takes positions we get irritated with? I just poked that monkey with this post.LOL :p
Stan is somewhat pessimistic about the chance of a functional disintegrating link being possible, while the rest of us are more optimistic. Regardless, Stan takes the Missouri ("show me") position, and without someone being actually motivated to incurr the considerable expense of designing, manufacturing, and debugging a link stamping assembly line--- we are at an impasse.
Stan doesn't see it in his mind's eye, but I think I do. If I had photoshop on my iPad I'd try to jerry-rig a photo of what I'm seeing, but I don't and I'm way too lazy to schedule an entire evening with an actual computer to figure it out (my computer-fu sucks).LOL
Designing a Grendel IAR - bwaites - 09-06-2014
stanc Wrote:I think an aluminum heat sink is an interesting approach. Could possibly be a very good idea.
JP makes heat sinked barrels, LRRPF52 has an MGI quick change upper if I remember correctly, Variable has a registered sear. As a group we could pull this puppy off without any cost but the barrels. I'd trust either Variable or LRRPF52 to put it together right, but since the sear is the legal piece that makes it work, that leaves it in Variables lap. A bunch of us will be in Utah in 10 days or so and we could discuss it round the campfire!
Designing a Grendel IAR - Variable - 09-06-2014
Ya'll are about 1600 miles too far over yonder bud.LOL
We still wouldn't have enough ammo either. Even if I burnt up what steel cased I have left now, it wouldn't really make a dent in any decent chrome barrel. I have a fair bit of Hornady and Wolf Gold MPT laid back for the zombiepocalyose, but it would take major coin to replace it, and the MPT isn't even to be had lately...
What would you be looking for data-wise?
Temps? I've been looking for an excuse to buy an IR thermometer. I want to measure suppressor temperatures anyway.
Burst group sizes at a certain distance? Doable. I can get plenty of PQC targets at work if I needed to.
Barrel life? That'd be the biggest bear. My pockets ain't near deep enough. This 12.5" LW build is stretching me already.LOL
I've still never learned how to do videos right. I'd have to email you the raw vid and then you could edit and post it I guess.
I don't think LRRPF52 would need to fess up his MGI upper though. I have extra upper receivers just laying here. It wouldn't be a biggie to simply slap one on a barrel if you needed two compared to each other or something.
To even compare two barrels you'd need a wealthy benefactor with an inside ammo connection though.LOL The cost would be up there!
I used to blast cases of M193 and M855 a lot when I was single and they were only about $150 a thousand. Things have certainly crept up a might in the interim.
If anyone could get a barrel and a large pile of ammo reasonably near me, I'd be more than happy to use one to see how hard it is to kill the other though.
