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1st Grendel Build: Parts List (so far) and Input Request - js8588 - 07-20-2017
I just about have all the parts together for my first Grendel build (and first AR build period). Going with a target rifle to start (then a hunting rig followed by a "life and liberty" project). I have all the upper parts purchased sans glass and bipod (probably going to save up for a nice Zeiss scope and just enjoy it with irons for now). Leaning towards an Accu-Tac SR-5 bipod, but I'm open to other suggestions.
Upper parts list:
Dez Tactical 19.3 inch keymod rail
Hardened Arms 24 inch Bull Barrel (lovely company with fantastic customer service)
Mega Arms side charging upper receiver
Young Manufacturing chromed side charging bcg and bolt
Geissele Super Ambi rear charging handle
Troy folding battle sights (HK style front sight)
Ballistic Advantage nitrided rifle length gas tube and .936 gas block
Seekins Precision ATC Muzzle Brake
The lower is still a work in progress. I'm not 100% sure which receiver to go with. I was planning to go with a Mega Arms GTR 3H Ambi, but now I'm considering a Seekins SBA15 since it's a couple ounces heavier and would help balance out that heavy barrel and handguard.
Lower parts list (already purchased):
Elftmann Match trigger (curved)
Elftmann anti rotation/anti walk pins
Magpul PRS Stock
Ergo Tactical Deluxe Grip w palm shelf
Battle Arms Development Enhanced Takedown/pivot pins
CMMG Safety selector.
I just need to settle on which lower receiver, a buffer tube/buffer system, and a mag release and I'm good to go. What say the experts here? Also, did I screw up any of my parts selection so far?
1st Grendel Build: Parts List (so far) and Input Request - mdram - 07-20-2017
i didnt know hardened arms sold just barrels, dont see them on the website either.
1st Grendel Build: Parts List (so far) and Input Request - js8588 - 07-20-2017
mdram Wrote:i didnt know hardened arms sold just barrels, dont see them on the website either.
http://www.hardenedarms.com/ecProduct_596_64-18%22%206.5%20Grendel%20QPQ-Barrel
1st Grendel Build: Parts List (so far) and Input Request - mdram - 07-20-2017
nice, they do have great customer service, i have a 5.56 upper from them
1st Grendel Build: Parts List (so far) and Input Request - js8588 - 07-20-2017
I'll be buying one of their Talon rails for another build I've got going.
1st Grendel Build: Parts List (so far) and Input Request - Lastrites - 07-20-2017
Well certainly that's one which is lacking in details to say the least. No mention of chamber type, bolt type or depth to name a couple...looks like a re-badged BCA.
1st Grendel Build: Parts List (so far) and Input Request - js8588 - 07-20-2017
Lastrites Wrote:Well certainly that's one which is lacking in details to say the least. No mention of chamber type, bolt type or depth to name a couple...looks like a re-badged BCA.
All of their barrels are made in house, not BCA. They're type 2.
1st Grendel Build: Parts List (so far) and Input Request - Kilco - 07-20-2017
Looking forward run some range reports on this rig. Not familiar with that barrel.
1st Grendel Build: Parts List (so far) and Input Request - js8588 - 10-27-2017
Starting to come together... [ATTACH=CONFIG]10033[/ATTACH]
1st Grendel Build: Parts List (so far) and Input Request - js8588 - 10-30-2017
Finished the lower myself. Have the upper minus the muzzle brake at the gunsmith (I don't own a vice/torque wrench etc). Turns out Seekins botched the threading so I'll be calling them in the morning.
Still need a scope, scope mount (going with a Larue mount probably), and a bipod (thinking Accutac). Probably will get some rounds through it with irons by Thanksgiving.
1st Grendel Build: Parts List (so far) and Input Request - stilesg57 - 10-30-2017
Build sounds like it's coming together well -- pic of the lower looks good. Really interested to see how that long handguard looks on a 24" barrel...I'm thinking going extra long with the handguard on my eventual build too.
Good luck with the Seekins call
1st Grendel Build: Parts List (so far) and Input Request - js8588 - 10-30-2017
Seekins was helpful. They're going to verify it's out of spec and send a new one. Was able to speak to a real person within about 2 minutes of calling.
1st Grendel Build: Parts List (so far) and Input Request - stilesg57 - 10-30-2017
That's good to hear!
I'm actually just giggling to myself about how similar our parts lists are...I haven't decided on a barrel/bolt/handguard yet but you're totally gonna guinea pig the rest of those parts for me all the way from the Mega upper receiver to the gen 3 PRS stock to the BA gas tube and block and even down to the enhanced takedown pins, ha. I'll be watching your threads closely!
Oh, to your last questions on your first post: any reason not to use a standard rifle tube and buffer? I'd go VLTOR A5 on anything that telescopes but given the PRS stock I'd just go mil spec rifle. Given that picture from the other day, have you already picked these out? For mag releases I am a huge fan of the Odin Works XMR gen 2 or 3 (not a fan of the gen 1) and have them on most of my rifles. I think you need the gen 3 to clear the anti rotation pins. I got my billet lower in a CO state theme and it mates with the Mega upper really well. It looks like yours fits the Mega nicely too and doesn't geek out on CO love though
1st Grendel Build: Parts List (so far) and Input Request - js8588 - 10-30-2017
stilesg57 Wrote:That's good to hear!
I'm actually just giggling to myself about how similar our parts lists are...I haven't decided on a barrel/bolt/handguard yet but you're totally gonna guinea pig the rest of those parts for me all the way from the Mega upper receiver to the gen 3 PRS stock to the BA gas tube and block and even down to the enhanced takedown pins, ha. I'll be watching your threads closely!
Oh, to your last questions on your first post: any reason not to use a standard rifle tube and buffer? I'd go VLTOR A5 on anything that telescopes but given the PRS stock I'd just go mil spec rifle. Given that picture from the other day, have you already picked these out? For mag releases I am a huge fan of the Odin Works XMR gen 2 or 3 (not a fan of the gen 1) and have them on most of my rifles. I think you need the gen 3 to clear the anti rotation pins. I got my billet lower in a CO state theme and it mates with the Mega upper really well. It looks like yours fits the Mega nicely too and doesn't geek out on CO love though
Went with a White Oak Armament rifle buffer tube (7075 T6), a standard rifle buffer and a chrome silicon buffer spring from Damage Industries.
No play whatsoever between the Mega upper and the Seekins lower. Not quite as perfect a fit as the CMT upper and Mega lower on the RECCE build I've got going, but pretty close.
1st Grendel Build: Parts List (so far) and Input Request - js8588 - 10-31-2017
The builder called me today. Another issue. The young mfg bolt will not go into battery with the barrel. I bought it from Rainier over the summer and after a quick look over the reviews, another buyer had the same issue with that bolt using a BSF barrel.
I called Hardened Arms just to confirm they use a type II chamber and they were, again, ridiculously nice (it's seriously like I'm talking to a close family member every time I deal with them). They do. The issue is definitely the bolt.
I emailed Young Mfg to see if they can help.
1st Grendel Build: Parts List (so far) and Input Request - Dcommoncents - 10-31-2017
A problem I had with a bolt not head spacing might give you some food for thought. About a year ago I was putting together a precision upper with a stainless 18" .223 wylde hanson profile barrel from ballistic advantage. To complement the barrel, I got a NIB x (? I can't keep the proprietary Nickel boron coating names straight but you know what I mean) bcg from WMD. Both components were beautifully made, but I could not get the bolt to close on the "go" gauge. A standard phosphate bolt that came with a S&W M&P 10 did, however, head space with that barrel.
I sent the NIB bolt back to WMD to test and they said it head spaced fine on 5.56 barrels, which is all they had to test. WMD then sent the bolt to Clint Hanson at Ballistic Advantage, who had this to say: "It is measuring on the tight side with multiple BA barrels right off the floor. When I say tightÂ….1 out of 6 barrels took the go guage with this bolt. The other 5 would not close on the go." Ultimately, it seems the NIB coating increased the bolt's dimensions just enough that it would play with the wylde chamber.
Point being, since you went with a chrome bcg, it at least seems possible that you are having a similar problem as the result of dimensional changes caused by that coating. If you/your builder have access to another grendel bolt that would be an easy way to rule out the barrel as the problem if another bolt head spaces properly.
1st Grendel Build: Parts List (so far) and Input Request - Dcommoncents - 11-01-2017
A problem I had with a bolt not head spacing might give you some food for thought. About a year ago I was putting together a precision upper with a stainless 18" .223 wylde hanson profile barrel from ballistic advantage. To complement the barrel, I got a NIB x (? I can't keep the proprietary Nickel boron coating names straight but you know what I mean) bcg from WMD. Both components were beautifully made, but I could not get the bolt to close on the "go" gauge. A standard phosphate bolt that came with a S&W M&P 15 did, however, head space with that barrel.
I sent the NIB bolt back to WMD to test and they said it head spaced fine on 5.56 barrels, which is all they had to test. WMD then sent the bolt to Clint Hanson at Ballistic Advantage, who had this to say: "It is measuring on the tight side with multiple BA barrels right off the floor. When I say tightÂ….1 out of 6 barrels took the go guage with this bolt. The other 5 would not close on the go." Ultimately, it seems the NIB coating increased the bolt's dimensions just enough that it would play with the wylde chamber.
Point being, since you went with a chrome bcg, it at least seems possible that you are having a similar problem as the result of dimensional changes caused by that coating. If you/your builder have access to another grendel bolt that would be an easy way to rule out the barrel as the problem if another bolt head spaces properly.
1st Grendel Build: Parts List (so far) and Input Request - js8588 - 12-03-2017
So, I thought I would have some rounds downrange by Thanksgiving...hahahaha. Oh, if only I knew...
The Young Manufacturing bolt carrier does not play nice with the Ballistic Advantage gas tube. I have 2 of them. One I purchased directly from Young Mfg and one through Rainier Arms. The gas key on both will not interface with the BA gas tube without excessive force (the bolt carrier slamming home WILL seat it but I scraped the hell out of the Geissele Super Charging handle when pulling it out again). Okay, I thought. Simple fix, right? Just order a different gas key.
The Eisenach nitrided bolt carrier and my LAR nickel boron bolt carrier both seat fine in the rifle.
I ordered a FailZero gas key with the intention of swapping it out on the Young's Chromed carrier.
Nope. That gas key doesn't work either.
I have a Spikes Tactical and a Voodoo Innovations (Adams Arms) gas tube coming in for 2 other builds I'm working on. I'll see if those fit the Young's gas key any better. Probably just going to end up using the LAR bolt carrier in this rifle.
Oh, and the bolt will seat with the Eisenach and LAR bcgs but it takes a bit more force than I'm comfortable with so, thinking about either a JP Enterprises 6.5 Grendel bolt or maybe a group by bolt right here on the forum.
1st Grendel Build: Parts List (so far) and Input Request - Sticks - 12-03-2017
Is your gas tube lined up/centered in the upper? Don't know that I have ever heard of that many problems getting a carrier/key to cooperate.
That many different keys and carriers, I'd be looking at the gas tube as the problem.
1st Grendel Build: Parts List (so far) and Input Request - js8588 - 12-03-2017
Sticks Wrote:Is your gas tube lined up/centered in the upper? Don't know that I have ever heard of that many problems getting a carrier/key to cooperate.
That many different keys and carriers, I'd be looking at the gas tube as the problem.
I also tried a separate Ballistic Advantage gas tube I have laying around by simply inserting the tube into the gas keys. It will not fit in either the Young's or the FailZero. Works fine with the Eisenach and LAR.
Whenever the US Postal (dis)service gets around to delivering the Voodoo and Spikes Tactical gas tubes I'll try the same thing. It may be the BA gas tube dimensions