Need Some Help Rail Related Geissele

[davidjinks]

I’m building a precision rifle based off a Colt and V7 18” barrel, 5.56mm, most likely shooting MK262 MOD 1 ammo.

The rail I am looking at is currently the G MK8 M-LOK 15” long.

Can you members here who have experience with the G rails give me some guidance? Please and thank you?

Pros/cons-strength/weaknesses. I’m set on M-LOK even though I have no preference between the 3 known mounting systems. I’m a quad guy ar heart but have no issues using M-LOK or KEYMOD.


TIA!

[markm]

I want to first start off by bitching about Geissele's lack of 7.0 rails now. That's not worth it's own thread, but I had to get it off my chest.

That said, any of the G rails are solid. I like the ones with pic rails at the end for Bipod attachment. I won't ever use any sort of Mlok nonsense. I just don't like it. But we've run the Mlok rail on the Super duty gun or whatever, and it's a rock, just like my Mk4 rail.

I'd LOVE to get his rifle Quad rail, but I can't justify $500 right now.... I'd pretty much end up building a gun around the rail.

[17K]

They all mount the same. I don’t know if the MK8 is really any better than a 14 or 16 for a precision role other than having more room under the gas block for the mlok nut if you end ip needing one there.

I like the G rails a lot.

[opngrnd]

I've run Mk8 rails on precision builds before. In fact, I have a 15" Mk8 on the shelf waiting for whenever I get around to building another precision upper. I may pair it with a 18" or 20" Criterion Core barrel for a modernized DMR setup.

PROS:
Barrel nut doesn't need timing
No issues with normal lo-pro gas blocks contacting rail
MLOK hardware should have proper clearance
Doesn't have the McDonald's straw feeling that some thinner rails do
Stout

CONS:
Not the thinnest rail
Not the lightest rail
Not the cheapest rail

[markm]

I've run Mk8 rails on precision builds before. In fact, I have a 15" Mk8 on the shelf waiting for whenever I get around to building another precision upper. I may pair it with a 18" or 20" Criterion Core barrel for a modernized DMR setup.

PROS:
Barrel nut doesn't need timing
No issues with normal lo-pro gas blocks contacting rail
MLOK hardware should have proper clearance
Doesn't have the McDonald's straw feeling that some thinner rails do
Stout

CONS:
Not the thinnest rail
Not the lightest rail
Not the cheapest rail

Well put. My MK 4 also has sharp edges. Not the end of the world, but a nice bead blast or whatever would make the pic rail notches a little less aggresive.

[gunnerblue]

I've used 15" MK4 and MK8 rails and they are very solid and well-suited to precision builds, imo. I can't really think of any downsides for that application other than price, I suppose, or if a quad rail was a necessity. If M-lok is wanted, there is always Larue to consider as well for a rock-solid rail.

[Pappabear]

Ive owned about every rail they G has ever made minus keymods, and all have been rock solid. Good luck.

PB

[One More Time]

If you're spending that much may as well spend a little more and get the Mk18 16" with the Arca rail.
Still has M-lok on the bottom if needed.

I was looking at that one for my 18" but that's a bit much for me right now.
Already have an Arca mount bi-pod and am looking to get a better tri-pod and Arca clamp instead of saddle clamp.
That rail is much cleaner looking than adding Arca plates to something.
Others have them for half the price but those look pretty sweet.

[Hammer_Man]

I’ve used a MK14 and MK13. I found both to be well made, and pretty sturdy once mounted. Installation was really easy, as there is no need to time the barrel nut. My only gripe is that they heat up fairly quickly compared to the KAC quad rails, and PRI tubes that I’ve used for most my other projects. I do realize that the MK8 isn’t as stream lined as the aforementioned MK14 and MK13. The heat issue isn’t limited to Geissele alone, as I’ve experienced similar heat soaking with a Mega monolithic upper that I put an 18” DD barrel in.

Pros: Very well made, easy install, looks cool for Instagram.

Cons: Potential heat soak, may not come with the proprietary barrel nut tool anymore.

[davidjinks]

I was looking at that one too. In your opinion, do you think the added cost of having the ARCA is worth it?



If you're spending that much may as well spend a little more and get the Mk18 16" with the Arca rail.
Still has M-lok on the bottom if needed.

I was looking at that one for my 18" but that's a bit much for me right now.
Already have an Arca mount bi-pod and am looking to get a better tri-pod and Arca clamp instead of saddle clamp.
That rail is much cleaner looking than adding Arca plates to something.
Others have them for half the price but those look pretty sweet.

[davidjinks]

I’ll be adding Railscales to combat some of the heat issues.


I’ve used a MK14 and MK13. I found both to be well made, and pretty sturdy once mounted. Installation was really easy, as there is no need to time the barrel nut. My only gripe is that they heat up fairly quickly compared to the KAC quad rails, and PRI tubes that I’ve used for most my other projects. I do realize that the MK8 isn’t as stream lined as the aforementioned MK14 and MK13. The heat issue isn’t limited to Geissele alone, as I’ve experienced similar heat soaking with a Mega monolithic upper that I put an 18” DD barrel in.

Pros: Very well made, easy install, looks cool for Instagram.

Cons: Potential heat soak, may not come with the proprietary barrel nut tool anymore.

[One More Time]

I was looking at that one too. In your opinion, do you think the added cost of having the ARCA is worth it?

It's $75 more for the integrated Arca rail, low profile with a flat bottom, no other rail or plate attached the bottom.
Just slide on whatever you are using on the bottom wherever you want it, which is usually a bi-pod and tri-pod.
If you're not planning on using Arca clamps then it's not really needed.

I have a Magpul bi-pod with Rail Grabber that works on both Pic and Arca rails and will use Magpul 2 slot Arca plates for now for a tri-pod
While the plates will work they are another attachment to fiddle with and the integrated rail is much cleaner looking.
I have a Wilson Combat 15" rail now that I don't like and have been wanting to swap it out for a while.
I'll probably end up getting something cheaper like IWI's 15.5" integrated Arca rail with plates on the rest.

[OutofBatt3ry]

I've got an MK4. Rock solid.

[e z money]

Geissele has blems on sale.

[davidjinks]

My cart is full of them, however, my wallet is playing hide and seek right now. I think it’s scared.



Geissele has blems on sale.

[e z money]

My cart is full of them, however, my wallet is playing hide and seek right now. I think it’s scared.
I bought one yesterday.