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Moderator
I cleaned it up paying particular attention to the extractor and chamber.. Replaced the buffer spring (which was visibly shorter) and fired 100 rounds of federal 55. Functioned fine but noticed it was ejecting around 1 o'clock. Might be time for a h3-4 buffer?
Let those who are fond of blaming and finding fault, while they sit safely at home, ask, ‘Why did you not do thus and so?’I wish they were on this voyage; I well believe that another voyage of a different kind awaits them.”
Christopher Columbus
Senior Member
Try replacing the extractor spring first. If the buffer spring was done, there's a better than fair chance that the extractor spring is too. And it would explain the forward ejection.Originally Posted by The Dumb Gun Collector
“You have made us for yourself, O Lord, and our heart is restless until it rests in you.” -Augustine
Moderator
That will be my next step then.
Let those who are fond of blaming and finding fault, while they sit safely at home, ask, ‘Why did you not do thus and so?’I wish they were on this voyage; I well believe that another voyage of a different kind awaits them.”
Christopher Columbus
Senior Member
A BRT gas tube is a MUCH wiser purchase... assuming the 1 o'clock is indeed too much bolt speed. Heavy buffers as a fix suck royally compared to correct gassing.
"What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v
Moderator
I like it. I wouldn’t mind swapping it out but I have no idea what port is on the 11.5 commando.
Let those who are fond of blaming and finding fault, while they sit safely at home, ask, ‘Why did you not do thus and so?’I wish they were on this voyage; I well believe that another voyage of a different kind awaits them.”
Christopher Columbus
Senior Member
Clint has a sizing question series to get you rolling. Current port is irrelevant.
"What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v
Manufacturer
Yes, if a new extractor spring doesn't bring it back to proper function, and it's still ejecting to 1:00, the next step would be to address gassing.
An EZTUNE is a great fix if the gas port is eroded but the barrel is otherwise fine.
Black River Tactical
BRT OPTIMUM Hammer Forged Chrome Lined Barrels - 11.5", 12.5", 14.5", 16"
BRT EZTUNE Preset Gas Tubes - PISTOL, CAR, MID, RIFLE
BRT Bolt Carrier Groups M4A1, M16 CHROME
BRT Covert Comps 5.56, 6X, 7.62
Member
For your future reference, minimum length for a carbine buffer spring is 10-1/16 inches. Its an easy check when your round count is getting up there as it can be measured with a tape measure. I check them about every 6 months or so with the amount of shooting I do on personal guns. At work they get checked quarterly. As others have stated, probably time for a new barrel as it seems like you have some port errosion leading to overgassing.
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