will it fit??

[txnavalaviator]

will a kx3 or a spikes warthog fit inside of a yhm lightweight free float?? the idea is to put one on a 7.5" barrel inside of a specter length...

while were at it would you do the above mentioned or just do a 10" with a patriot ordnance brake?

keep in mind that this will be a side-charger and the bolt carrier group is heavier.

 

[338Shooter]

Yes, the KX3 will fit under a YHM rail. I don't know about the Spikes, but I'd imagine it would also fit. My silencer is 1.375" and it clears my YMH rail with PLENTY of room.

If I were building an SBR I think I'd rather have a 10-12" barrel, but the 7.5s are very fun as well.

Be prepared for major gas in the face with the side charger.

 

[txnavalaviator]

wow i didn't know sidechargers were bad about gas in the face. the 7.5 might help out a little being a pistol length gas system.

is the accuracy really night and day between 7.5" and 10" i figure if i'm spending 200$ on a stamp i want to stay below 10"

 

[338Shooter]

Accuracy is probably not a factor between 7.5 and 10". 7.5s can be very finicky to get running right. The longer the barrel and gas system the smoother the gun will run typically. With a pistol length gas system you'll probably get more gas in the face. There is more pressure when the bullet passes the gas port than a longer gas system will see.

The 7.5s are fun as all get up to shoot when they run well. Also, some folks never have a problem getting them to run. The concussion and fireball from the 7.5s is definitely grin inducing, but it can get obnoxious. The 10.5s aren't much better about the concussion, but they are better.

It all just depends on what you want. I think for the few extra ounces and 3" added lenth, I'd rather have a 10.5 than a 7.5, but since it's an AR you can always have both uppers to use on your one SBR lower.

 

[txnavalaviator]

well i haven't put in for my stamp yet because i'm still deployed. but if i'm not mistaken couldn't i just register it for 3 legnths/calibers?

 

[338Shooter]

No, you put the primary length caliber. As long as you keep the original upper that you used you can swap them at will. If you decided to sell the upper that made it into the registered configuration, you just write the ATF a letter so they can update the registry with the new "primary" config.

They don't dig on multiple calibers/lengths anymore.

 

[Scott_In_OKC]

Insert gratuitous 7.5" pron here...

Mine has been 100% reliable running an H buffer and full auto carrier.

 

[Glocktogo]

Insert gratuitous 7.5" pron here...

Mine has been 100% reliable running an H buffer and full auto carrier.

How's your ejection patern? I'd think you'd be overgassed with a H.

 

[Scott_In_OKC]

How's your ejection patern? I'd think you'd be overgassed with a H.

Doing the research on Arfcom once I decided on a 7.5, most were running an H buffer and M-16 carrier. So I went with it as well. Other than the loud bark, I really don't notice any difference in operation with the shorty over a full size AR.

 

[AdvantageR1]

Is that a full auto carrier group? If so do you have to register that as well?

Thanks,
Bobby