Drawbacks to semi-auto bolt carriers?

[opngrnd]

Obviously, we all prefer the full auto version, but are there any reliability issues with using semi-auto bolt carriers? I've been looking for a LMT Enhanced Carrier and I have a line on a semi-auto one. I'm looking to continue with gas-to-the-eye mitigation by using an enhanced carrier with a heavier bolt.

[Straight Shooter]

No probs in the LMT Ive been running for 13 years now. NOT ONE.

[Clint]

Why not just dial the gas down?

I'm looking to continue with gas-to-the-eye mitigation by using an enhanced carrier with a heavier bolt.

[opngrnd]

Why not just dial the gas down?

Gas is already dialed down a bit via GT being set up for 50/50 supp/unsupp. I'm running the Tubbs FW spring with an A5H3 after finding it has less dot movement than the other spring options. Several other threads have mentioned a Tubbs FW/A5H4/E-carrier combo to help keep gas out of the eye. Since the S/A E-carrier is in a rifle with a BRT 16" Opt barrel, which I believe is unneeded given how well you did on those 16" barrels, I'm going to try pairing the E-carrier with the Tubbs and A5H4 and see if it cuts the gas down a bit. I'd like to know if there are any mechanical reliability issues that a S/A carrier might induce before I start the experiment. I may also add the Radian CH specific to this application down the road.

[bamashooter]

Obviously, we all prefer the full auto version, but are there any reliability issues with using semi-auto bolt carriers? I've been looking for a LMT Enhanced Carrier and I have a line on a semi-auto one. I'm looking to continue with gas-to-the-eye mitigation by using an enhanced carrier with a heavier bolt.

Not really though most of mine are "full". ARs are very simple, reliable, and waay over-exploited for profit and self-worth.

[17K]

As long as it’s not a Colt type with the half circle back part and the cut out that exposes the firing pin, they’re fine.

[jsbhike]

As long as it’s not a Colt type with the half circle back part and the cut out that exposes the firing pin, they’re fine.

The carriers with the ramp cut to expose the firing pin are (as far as I know) a total no go when combined with an M16(large head) firing pin and old school AR-15 hammers that have the notch cut in them instead of the M16 rounded profile.

[opngrnd]

The carriers with the ramp cut to expose the firing pin are (as far as I know) a total no go when combined with an M16(large head) firing pin and old school AR-15 hammers that have the notch cut in them instead of the M16 rounded profile.

Thank you. Which particular notch are you referring to?

[jsbhike]

Thank you. Which particular notch are you referring to?

Far right on top(and bottom) are notched. Rarer and rarer to see them I think, but they are around.

http://www.biggerhammer.net/ar15/hammers/

Usually/by design) that hammer combined with M16 firing pins(that have larger retaining collars) will snag and lock the action up when used with the bolt carriers that have the ramp cut away exposing more of the firing pin.

Was a Colt thing that most everyone else copied till Colt ditched it 15? years ago roughly.

Sent from my LM-X410.FGN using Tapatalk

[opngrnd]

Far right on top(and bottom) are notched. Rarer and rarer to see them I think, but they are around.

http://www.biggerhammer.net/ar15/hammers/

Usually/by design) that hammer combined with M16 firing pins(that have larger retaining collars) will snag and lock the action up when used with the bolt carriers that have the ramp cut away exposing more of the firing pin.

Was a Colt thing that most everyone else copied till Colt ditched it 15? years ago roughly.

Sent from my LM-X410.FGN using Tapatalk

Much appreciated! I've heard of the notched hammer, but never needed to know what it was until now.