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Hi,i got a refurb Garand ,new barrel(brake in is done)i want use adjusble gas plug(op rod possible damage),am not reloading,am using commercial ammo,Prvi Partizan .30-06 Springfield 150 Grain FMJ.
Adjusble gas plug got 5 jet,witch one i should start with,thank for your help
Bear with me here, as we not only need to answer your question, but make sure no damage is done to the rifle.
The short answer is to start with the largest orifice, and work down in size until the rifle cycles reliably. But before you start, you might want to look into a few things.
If the provenance of the op rod spring is unknown, I strongly recommend you replace it with one of new manufacture. The spring in most surplus M1's is likely between 50-70 years old and has taken a set after use and being in compression all those years. A new spring will make the rifle shoot noticeably softer, and the action will be snappier. Most important, it will reduce the pounding the receiver takes when the bolt stops at the end of it's travel rearward. Don't forget to grease the spring with rifle grease.
Fulton Armory has new springs made to the original print by one of the original contractors.
Operating Rod Spring, New, Fulton Armory GI Spec
(I realize his may not help much as Fulton won't ship outside the US, but others may find it useful)
Ammo:
Privi Partizan makes two different 150gr FMJ loads. Under their military product line, they list M2 Ball. If this is the ammo you have, the standard plug will work fine. This would be the same as USGI M2 Ball that the rifle was designed to shoot.
Under their sporting ammo line they list another 150gr FMJ load that is loaded 100fps faster than GI specs. If this is the ammo you have, it would be prudent to use the adjustable gas plug.
Have you considered using a Schuster adjustable gas plug?
http://www.schustermfg.com/
I'm sure he doesn't have a Schuster, he's in Canada and we only have about one source here. The State department won't allow those and others in Canada. The directions given to start with the largest oriface are correct. Change to a smaller hole until the rifle functions. The brass should drop right beside you when you're finished.
Hi,thank for all information,all the parts are nos,i shooted about 40 rouds,casing is flying 2 feet away,not just beside me,so that mean to mutch gas...when casing flying all over..
im in ontario and ordered my plug from McCann Industries gave them my mastercard and they mailed them direct to me ,no hassle ,no problem.
The normal ejection pattern for the M1 with service ammo and the issue plug is from 1 o'clock to 2 o'clock and from 2-4 feet from the rifle when fired from prone. if this is what you are getting, that's normal.
What browningautorifle is suggesting is that you select an orifice that is just enough to cycle the action, plus a little more for reliability, but no more. For civilian use, this is fine, and it will make finding your brass easy.
I tried to order various gas cylinder lock screws from the US and couldn't get them. I had to buy local. It all worked out at any rate.That's OK, like no4 mk1t says, mine were going from 10 o'clock to 6 o"clock and from beside me to 30 yards away...Quote:
Originally Posted by hightlander138
Analyzing the ejection pattern is one of the methods of determining whether or not a M1 is performing properly.
If you have a weak op rod spring, bolt velocity is increased and the ejection becomes more violent and less uniform. A well tuned M1 should "pile them up" in about a 24" circle when fired from prone on grass or other surface where the brass lays where it lands.
This of course is with either USGI M2 or M72 ammo or equivalent hand loads. Other factors also contribute such as a good straight well fit op rod that doesn't drag wood. (you would be surprised how many do)
Mine's in 7.62 and I've been using a mixture of IVI ball and some Lake City Match. Every year was present from 1959 to current calendar. The adjustable gas cylinder lock screw tamed that down but now some older cartridges barely function. Another 600 rds and I'll be handloading Hornady 150s and IMR 4895. Then the problem will be solved. I understand what's happening and am not in the least worried.