Surefire ICAR

LRRPF52 · Feb 1, 2025

I wonder who will be next or is already in the process of adopting the new receivers and Magpul ICAR PMAG compatibility?

LWRCi is already poised to produce firearms with a simple barrel/bolt install with their existing Six8 receivers, but I would really like to see them use their new semi-monolithic upper.

ADM would be nice with their ambi lower and funnel mag well.

Noveske would be a great place to see a 338 ARC in the form of their Ghetto Blaster.

Shoreglide · Feb 1, 2025

I’d probably be all over a semi monolithic receiver that takes the new ICAR Pmags. Currently waiting to see what actually comes to market over the next few months.

Spd37 · Feb 1, 2025

I want thicker bolt lugs that’ll handle bolt gun pressures

rlsmith1 · Feb 1, 2025

Spd37 said:
I want thicker bolt lugs that’ll handle bolt gun pressures

Agreed, otherwise this is pointless to me. I’m not taking my 6 ARC to war so a potential broken bolt isn’t the end of the world and a non standard AR isn’t very exciting if it can’t increase performance but I’m not holding my breath.

Only solution I see is something like 223 and 556 distinction for basically the same thing

Spd37 · Feb 1, 2025

rlsmith1 said:
Agreed, otherwise this is pointless to me. I’m not taking my 6 ARC to war so a potential broken bolt isn’t the end of the world and a non standard AR isn’t very exciting if it can’t increase performance but I’m not holding my breath.

Only solution I see is something like 223 and 556 distinction for basically the same thing

It’s weird PSA made this larger 6arc and different bolt when all they had to do was make that set what 40-60 thousand larger? I don’t get it

LRRPF52 · Feb 2, 2025

Spd37 said:
I want thicker bolt lugs that’ll handle bolt gun pressures

Just for reference, when Remington did the 30 RAR, which had an AR-10 diameter bolt head with AR-10 cross section lugs, with a corresponding AR-10 diameter barrel extension, they limited the SAAMI MAP to 55,000psi.

The bolt lug lengths were still AR-15 length, as were the tooth lengths in the barrel extension.

Spd37 · Feb 4, 2025

LRRPF52 said:
Just for reference, when Remington did the 30 RAR, which had an AR-10 diameter bolt head with AR-10 cross section lugs, with a corresponding AR-10 diameter barrel extension, they limited the SAAMI MAP to 55,000psi.

The bolt lug lengths were still AR-15 length, as were the tooth lengths in the barrel extension.

I guess what I really mean is the aera between the case head and od needs to be thicker

J.Milanos · Tuesday at 10:06 AM

Hey guy's, I think we need FN to finish bringing out the 6.5X43 cartridge, mags and weapons system... We all know the restraints of the M16/M4 platform is the magazine length.. This new cartridge takes care of this... Mag Pul does make the mags for this weapons system... Just my thoughts... Jerry.

LRRPF52 · Tuesday at 3:31 PM

J.Milanos said:
Hey guy's, I think we need FN to finish bringing out the 6.5X43 cartridge, mags and weapons system... We all know the restraints of the M16/M4 platform is the magazine length.. This new cartridge takes care of this... Mag Pul does make the mags for this weapons system... Just my thoughts... Jerry.

That receiver set is bigger than an AR-10, which is the opposite direction we should be going in bulk/weight. It also uses .473” case head diameter cartridges, which require fat magazines that don’t stow well on the fighting load. Cartridge mass pulls away from your core with AR-10 width mags, which I have never liked.

If you used those magazines with a traditional AR-15 design, with small receivers and an appropriate bolt and barrel extension, it might make sense for a DMR. The performance they are getting from that cartridge is impressive though.

This is more of the direction NGSW should have gone, but the contenders are trying to get away from the AR-15 Stoner design, and establish traction with whatever system they can come up with. I really think that’s a losing strategy.

The imagined requirements for a folding stock are not sound, nor are the regressive trends to external piston operation. It’s just that these companies can’t find a better way to make the action.

Chrsclnngr · Tuesday at 5:11 PM

I am pretty sure the 6.5x43 LICC is a .445 bolt face (.441 case head diameter), i.e. a stretched 6.5 Grendel. The receivers/ magazines should fall somewhere between the AR-10 and the AR-15. I for one would be interested in seeing this cartridge in the wild to confirm its dimensions. (COAL 2.64)

LRRPF52 · Tuesday at 5:25 PM

Chrsclnngr said:
I am pretty sure the 6.5x43 LICC is a .445 bolt face (.441 case head diameter), i.e. a stretched 6.5 Grendel. The receivers/ magazines should fall somewhere between the AR-10 and the AR-15. I for one would be interested in seeing this cartridge in the wild to confirm its dimensions. (COAL 2.64)

That was .264 USA, which was a Carcano/Grendel case head diameter and longer case at 2.600” COL.

6.5x43 LICC is something different, with a .473” case head and slightly-shorter COL, high-strength steel cases, extreme chamber pressure:

Chrsclnngr · Tuesday at 5:59 PM

LRRPF52 said:
That was .264 USA, which was a Carcano/Grendel case head diameter and longer case at 2.600” COL.

6.5x43 LICC is something different, with a .473” case head and slightly-shorter COL, high-strength steel cases, extreme chamber pressure:

I stand corrected. Thank you!! I would be interested in seeing both of these in the wild. I believe I would be more interested in the .264 USA.

LRRPF52 · Tuesday at 6:11 PM

Shoulder angle on .264 USA is too shallow for an efficient propellant conversion and tight SDs.

I think it was designed that way based on the theory that 20˚ shoulders feed better.

Chrsclnngr · Tuesday at 6:54 PM

LRRPF52 said:
Shoulder angle on .264 USA is too shallow for an efficient propellant conversion and tight SDs.

I think it was designed that way based on the theory that 20˚ shoulders feed better.

Maybe some day someone will create a .243 USA AI ( a .264 USA necked down to 6mm with a 40 degree shoulder ) who knows? Maybe an AR-12 (Midsize) Platform!! Just random thoughts!!

LRRPF52 · Tuesday at 7:01 PM

Chrsclnngr said:
Maybe some day someone will create a .243 USA AI ( a .264 USA necked down to 6mm with a 40 degree shoulder ) who knows? Maybe an AR-12 (Midsize) Platform!! Just random thoughts!!

If you have 2.600” COL, then you would want to look at .257” and crush all the 6mms quite easily, and most of the 140gr 6.5mm for BC using 131-138gr 25 cals.

But it’s only .2” shorter than 7.62x51/6.5CM etc.

J.Milanos · Tuesday at 9:54 PM

The receiver on the 6.5X43 is smaller that an AR-10, the mag well is larger than a AR-15 mag well... The case is based off the 308/6.5Creedmoor case and is 1mm shorter than my 6GT.. This cartridge's effective range is over 800meters. Weapon weight in short configuration is approx. 6 1/2 pounds, longer barrel more weight..

J.Milanos · Tuesday at 9:56 PM

A 25GT with heavy bullets would be very welcome.. The weapon runs off long stroke gas system also....

rlsmith1 · Wednesday at 12:31 PM

Seems like if you combined this with this high pressure case heads of the NGSW program you might have a pretty potent goldilocks system in 25 cal. Short barreled 6.5 or 7mm variants would be really cool too. A 338 version might be a nice bigger brother to the 338 ARC for supers and still work well with subs

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