13” 308 MCX SPEAR??

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Lots of questions/debates over the SPEAR itself, but I’m mostly curious what everyone thinks of running a 308 with a 13” barrel.

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I would get a SCAR and send it to Jared at Parker Mountain. He can cut the SCAR barrel and pin your muzzle device to a clean 16.1”. He specializes in the SCAR.


Here is one cut to 14” that is 16.1 OAL.


If you go with a 13” SPEAR I would form 1 it. Having a brace on a 7.62 is not real practical. The braces won’t handle the recoil impulse over time.

Well you gain a ton of mobility, assuming it will wear a suppressor. You very well may lose much more, though. Seems awful short for .308.

The only thing I dislike about suppressors is they are absolute ergo killers.

I hope you plan on suppressing it. I’ve got a 556 sbr either 10.5 or 11.5, I double up on ear pro to shoot it. I’d have to imagine 308 gonna be worse. That’s the main reason I went 18 over 16 on my ar308 build.

I was able to shoot the 556 and 308 spear at a shoot sig event. The 308 suppressed had surprisingly low recoil for a 308. It was one of the better shooting 308s I have ever shot, but it comes with a pretty steep price tag. I can't see any advantage of the 13" over the 16". To me dealing with the SBR/brace over 3" on a large frame rifle isn't worth it. I liked the 556 spear so much I got one. It's my favorite AR platform rifle I have now.

Why can you believe the short barrel in the .277 but not the .308?

60,000 PSI for a 308 round, vs 80,000 on a 277. Given the same barrel length and projectile weight, the 277 is going to be much faster because it has more pressure behind it.

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60,000 PSI for a 308 round, vs 80,000 on a 277.

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That's the whole reason for the 3 pc cartridge. The stainless steel case head can handle the higher pressures.

I have a 9” Spear LT in 300BO. It’s a sweet shooter.

I don’t see the appeal of a 13” .308, other than LARPing the NGSW. It’s gonna be loud as shite unsuppressed and doesn’t have the subsonic capabilities 300BO does.

The appeal of the Spear, IMO, is that it uses a piston system. That makes it foldable for compactness, to put in a backpack, home defense, or firing from a vehicle. You are sacrificing that compactness by using a 13” barrel, and not getting the full potential from the .308 cartridge while making that sacrifice.

If I would prefer a shorter (6.75” Rattler LT or 9” Spear LT) 300 blackout or a 14.5” 5.56 over a 13” .308.

This whole thought process started by wanted to have another option when it come to commonly available calibers if/when we experience another ammo shortage.

I want to add 308 to the mix, but have no desire to lug around a long barreled rifle, plus suppressor. This would be 100% suppressed, so I’m definitely taking the added length vs sound reduction into consideration.

If 13” would get me to 600yrds I think I’d be fine with it. But even at 13” plus the length with a 5” can and I’d still be at 18” overall…