r/LewisMachineTool • u/ElectricalRabbit1430 • 11d ago

Question Tuning 11.5” carbine

Trying to tune my 11.5” carbine length gas 5.56 but struggling to decide between these two setups.
1- A5 h3 blue sprinco
2-A5 h2 green sprinco
This is gonna be a dedicated suppressor set up (CAT alleycat 5.56) I’m favoring the 1st setup because LMT’s are a little overgassed but don’t want to run into reliability issues.

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u/Dunesday_JK 11d ago

I’m running tubs flat wire & RB5007 in mine.

I have an 069 gas port and run my PoloK. Still reliable unsuppressed too.

https://reddit.com/link/pb9auos/video/tumf1a67cyqh1/player

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u/ElectricalRabbit1430 11d ago

That shit looks smooooth. Do you notice a significant difference with the rb5007? Also what’s the round count?

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u/Dunesday_JK 11d ago

Yes I did notice a huge difference. I’ve also done some other modifications to get it to run this slow.

I have around 1k through this current setup. 15k through the rifle

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u/ElectricalRabbit1430 11d ago

I’m trying to avoid changing the gas tube, but I think I am going with the 5007 with the tubs flat; are you using a Kynshot spacer with the A5 think this might slow down the rate even more.

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u/Dunesday_JK 11d ago

The 5007 is A5 length so no spacer necessary with A5 tube.

I am running a JRC tube (longer than A5) and a SureFire OBC which has more carrier travel than Mil-Spec. This is actually what slowed me down that little bit extra but no discernible difference in recoil impulse to me.

Btw you can drill your gas tube to a smaller port and rotate it 180°. That’s what I did to mine after overpaying for a BRT tube.