So I've been working on adding settings and tuning my Sig patrol swat and wanted to let the other 556 owners know the results of the port size testing.
I've ground in 6 total settings to the gas block. The original port into the piston was around .40 with a .42 or something out port. Which the out port basically has no effect on the cycling at all by the way so don't enlarge your factory out port. DON'T DO IT!...lol.
I just tested the first setting and progressively larger bits. I am using no out port at all for these. Keep in mind mine is the patrol length probably take larger bits for a full length system.
.025 #72 Came back far enough to get the shell out of the chamber and stop.
.028 #69 Eject case almost straight forward about 4 feet and didn't chamber the next round.
.032 #67 Ejected 12 feet at a 45 degree angle.
Case damage is reduced big time. It now leaves two very light dents one midway down the case, and on the bottom of the case rim. Normally these dents are big... the rim dent actually makes the cases very hard to fit in a shellholder. It use to eject 30 feet...
I've ground in 6 total settings to the gas block. The original port into the piston was around .40 with a .42 or something out port. Which the out port basically has no effect on the cycling at all by the way so don't enlarge your factory out port. DON'T DO IT!...lol.
I just tested the first setting and progressively larger bits. I am using no out port at all for these. Keep in mind mine is the patrol length probably take larger bits for a full length system.
.025 #72 Came back far enough to get the shell out of the chamber and stop.
.028 #69 Eject case almost straight forward about 4 feet and didn't chamber the next round.
.032 #67 Ejected 12 feet at a 45 degree angle.
Case damage is reduced big time. It now leaves two very light dents one midway down the case, and on the bottom of the case rim. Normally these dents are big... the rim dent actually makes the cases very hard to fit in a shellholder. It use to eject 30 feet...