223 to 6.5 Grendel - Stocks

[BearNaked]

I have an AR pistol in 223 and looking to build an 18" 6.5 Grendel that I can swap between. The reasoning behind not just building a designated Grendel is my two gun case is only 32" long and I already have the lower setup perfectly.

Does anyone swap out their stocks between a pistol brace and something like a Luth AR stock? interested in other stock options as well. was looking for something with a flat bottom for a rear bag.

my whole purpose of this is to have something that I can carry easily and swap between depending on what im doing. yes I know it wont super fast but it should only take an extra 20 seconds.

 

[hlee]

I could be wrong, but I think you will also need to switch your pistol buffer extension to a carbine or rifle extension. And, then change your buffer and spring. Sounds like a lot of effort for little gain over having a complete rifle set up.

 

[MtnCreek]

Depends on the brace. SB3 uses a carbine buffer tube.

 

[BearNaked]

I have the SB3 brace and it uses the standard carbine buffer tube. The spring and buffer will stay the same and I will use an adjustable gas block to tune it. right now it is using a blue spring with an H2 or H3. this should be sufficient for the Grendel.

it should really only be pulling the pin down, pull off, pull pin down, put new one on. I know its a lot of thinking for something to just try out but was curious if anyone did this or I am out on my own.

 

[CaptNemo]

You may want to read up on the legalities of putting a stock on a pistol AR.
You may get into Short Barreled Rife territory and the BATF might take exception to you not paying your Tax and waiting for written permission.
I’ll mind my own business now.

 

[MtnCreek]

Pistol to rifle with 16"+ barrel is OK. As long as it started out as a pistol.

 

[CaptNemo]

Pistol to rifle with 16"+ barrel is OK. As long as it started out as a pistol.

From what I recall, it’s going from rifle configuration back to pistol is where BATFE get their collective panties in a wad.

 

[MtnCreek]

@CaptNemo Pistol to Rifle and back to Pistol is OK. If originally configured as a pistol, it's a bona fide tranny. If originally a rifle, it cannot be configured as a pistol.

 

[BearNaked]

I have an AR pistol now so making it into a rifle and back to a pistol is completely legal. I have pictures of it as a pistol from the day it was complete to prove that.

I guess ill just try my theory out and see how it works. once it is all complete I will post up some pics of the setup.

 

[Leonard yadao]

I have an AR pistol now so making it into a rifle and back to a pistol is completely legal. I have pictures of it as a pistol from the day it was complete to prove that.

I guess ill just try my theory out and see how it works. once it is all complete I will post up some pics of the setup.

You ave pics planning that same route but will be using 20 in barrel

 

[Primus]

An AR lower is like $150 complete. Just build another lower.

 

[hlee]

An AR lower is like $150 complete. Just build another lower.

Truth! Unless, you live somewhere that limits the number of firearms you can own.

 

[BearNaked]

An AR lower is like $150 complete. Just build another lower.

stripped lower $100
Trigger $130-200+
Stock $50-150

The $150 lower you are talking about is just the standard lower with the 9lb trigger and a shitty stock so I would have to replace all of that anyway. no thanks.

in the original post, I stated that a complete 18" rifle wont fit in the case which is why I was wanting to switch between the uppers. maybe one day I will build a designated lower for it but I wanted to run this setup and see how I like it sine it will make traveling with it very easy.

Truth! Unless, you live somewhere that limits the number of firearms you can own.

Texas so no limits. just not enough money.

 

[BearNaked]

You ave pics planning that same route but will be using 20 in barrel

I should have the upper in today so I can take some pics of what I am trying to do and post them on Monday when im back in front of a computer.

 

[hlee]

Before someone comes in and says "go be poor somewhere else," consider the following... Add stock of your choice. Lowers are pretty cheap to build, even with quality parts. And, the accuracy is in the barrel. In the end, you will be much happier with a complete rifle...

 

[DJL2]

Ultimately, as long as the buffer and spring are GtoG for the caliber in question, it doesn't matter what upper you put on it. No different than swapping rifle to rifle, since you're really just running a rifle with a "look at me, I'm legally a pistol" stock on it...uh...brace...I meant brace. Looking forward to how your 6.5 G run and how it shoots.

ETA: I've shot a 5.56, 6.8 and 6.5 all off the same lower, as well as swapped a 6.8 and 6.5 back and forth on the same lower just trying to assess different variables in how each lower and upper performs. The gun doesn't care what stock you have on it, or if you call it a brace...same receiver extension, same action spring, same buffer...that's what matters.

 

[BearNaked]

@hlee again, the complete rifle wont fit into the case. so i wont be happy having to order a new case plus ordering all the other parts. I am not sure how people are not understanding this concept. I am only one person so i can only shoot one at a time and swapping out an upper is quick enough. 2 pins and mag change.

@DJL2 all the important parts for the lower are G2G. H2 buffer with blue spring and the SB3 brace is on a carbine tube so if I want to change out the stock then it will fit. ill be running an AGB on the Grendel to adjust it so it works properly with this setup. Should have all the parts next week to finish the upper and will be on the range next weekend to test my theory. I don't run a brace for a "look at me, im a pistol", I run it so I can use a short barrel to get in and out of trucks/polaris better when hog hunting and the SBR tax stamp wouldn't come in until after hunting season. Eventually I might get the stamp but then again I might just leave it on since it does irritate people that have an SBR tax stamp.

 

[MtnCreek]

Might want to put an H1 and carbine buffer in the bag when you head to the range. Different animal, but H2 would not function in my 12" grendel.

 

[DJL2]

Yeah, man, sounds like you're set. I'm looking forward to the range report, seems like a cool 2-guns-in-one project. I know we all love stand alone setups, but part of the strength of the AR-15 is to be able to run it this way with multiple uppers on the same lower.

I apologize if my humor failed...I suppose I ought to be used to that at this point. Wasn't trying to bag on you at all, or throw shade or whatever we're calling it now. Unless you secretly travelled time to help pass the NFA...in which case, we need to have a talk.

 

[Primus]

Lol at any buffer setup will work. That is one of the dumbest things I have ever read on here. There are a multitude of variables including but not limited to: port size, port diameter, gas block, gas block installation, carrier, buffer tube, spring, buffer type, buffer weight, ammo, suppressor and environmental factors that could lead to:

A gun that is over gasses
A gun with the correct gassing
A gun that is undergassed
A gun that will not always cycle
A gun that is essentially a bolt action.

And then double those conditions when you add a suppressor and qudruple if you shoot different loads.

Build these things long enough and build enough of em and you may learn that it's not a plug and play system.

And the skip the piece of shit rra and get a G2S or MBT. Well unless you like trigger failures rending your gun inopperable. Your choice.

 

[Primus]

Lol at can't afford a lower but somehow affords the money for a specialised (ie expensive) round.

Irony.

 

[DJL2]

Lol at any buffer setup will work. That is one of the dumbest things I have ever read on here. There are a multitude of variables including but not limited to: port size, port diameter, gas block, gas block installation, carrier, buffer tube, spring, buffer type, buffer weight, ammo, suppressor and environmental factors that could lead to:

A gun that is over gasses
A gun with the correct gassing
A gun that is undergassed
A gun that will not always cycle
A gun that is essentially a bolt action.

And then double those conditions when you add a suppressor and qudruple if you shoot different loads.

Build these things long enough and build enough of em and you may learn that it's not a plug and play system.

And the skip the piece of shit rra and get a G2S or MBT. Well unless you like trigger failures rending your gun inopperable. Your choice.

I love your posts - some of the most entertaining, certainly. Read your list and identify which of those apply to the lower and which apply to the upper and which are completely independent, then go back and consider the context of the thread. Then make another condescending post for my amusement if you so choose. Happy New Year.

 

[Primus]

The point is, you can't assume any buffer will just work. H2 or H3 are the safest bets but no guarantee.

 

[BearNaked]

@DJL2 my bad, I thought you are trying to be a condescending ass. I usually assume on here that 1 or 2 out of every 4 or 5 comments is someone just being an ass instead of actually trying to help out. I did not get any pictures of the setup in the bag like I talked about. too much finger banging the damn thing to get pictures. I did get one of the upper ill post here in a second once it uploads.

@Primus yes there are multiple variables that go into the gun working properly as I now have spare buffers and springs from them not working on the shorty. however, after talking with a several people that build AR's, they have told me that an H2 and blue spring should be pretty close to the sweet for a good portion of the calibers in the AR15. One of the local shops that helped me build the 11.5" says they always start at the back of the gun and work your way forward. maybe I will just hit the sweet spot and get lucky. maybe I scrap this whole idea because nothing works. only one way to find out.

yes I did pick a more expensive round than a 223 but not as expensive as my 260 which has double duty of a competition and hunting gun. my whole purpose is to only carry one case but have 2 guns that will work off of the same lower. I am sick of carrying the pelican plus the ar plus the range bag. Being that my new AR bag is only 32" the Grendel wont fit with the lower attached to it. hence why I made this post about changing out stocks and if anyone has done it. I would be able to build a lower if I wanted the Grendel as a stand alone gun but I don't. yes it would take me longer to save up to complete it but I would rather spend that money on the ammo and the rest of the gun instead of something that wont fit in my current case.

I am not sure about the trigger rant as I haven't mentioned anything about a trigger but mine is pretty solid. only about 6-7000 rounds on it.

 

[BearNaked]

 

[DJL2]

@BearNaked - yeah...understandable, really, it IS the internet. I married the first person who didn't respond to my jokes by slapping me, so clearly I'm not nailing the delivery side.

 

[palmettoman]

@CaptNemo Pistol to Rifle and back to Pistol is OK. If originally configured as a pistol, it's a bona fide tranny. If originally a rifle, it cannot be configured as a pistol.

But, if a pistol IDENTIFIES as a rifle, I'm good no matter long it is, right?

Sorry, but I didn't see enough smart-a$$ comments in this thread. . Just foolin' around.

OP, I run different uppers off of one lower also...same caliber and all of them are rifles, tho. Keep us posted how the buffer/gas system work with your lower. What length gas system on your pistola?

 

[BearNaked]

But, if a pistol IDENTIFIES as a rifle, I'm good no matter long it is, right?

Sorry, but I didn't see enough smart-a$$ comments in this thread. . Just foolin' around.

OP, I run different uppers off of one lower also...same caliber and all of them are rifles, tho. Keep us posted how the buffer/gas system work with your lower. What length gas system on your pistola?

Yea I figured I would get a lot more hell than I have gotten.

On the pistol, I am running a carbine length gas tube with an 11.5" barrel and a rifle length gas tube with an 18" barrel.

I will have some results this weekend on how well it shoots and how switching it up works as far a function goes.

One of the barrels will have an adjustable gas block on it while the other will be a normal gas block. if the Grendel doesn't function properly on the setup then I will have to rethink the whole system. only one way to find out.