Is it possible to buy direct from Crane? If so how?
Thanks
I don’t think so. They’re a Naval Surface Warfare Center. I think you could buy from them about as much as you could by a 16" gun barrel from NSWC Dahlgren, VA.
I bet you could get a good deal on backpacks for school at JFKSWC.
Sure… Head on down to the nearest Navy recruiting office.
Yes you can buy from Crane, either be a federal agency or a contracting company supporting a federal agency and you can get training and buy supplies from them. All it takes is a MIPR
That would be a big negative.
Well these companies selling the Crane O-ring are getting them from somewhere, im just wondering where?
The O-rings themselves are not from Crane. They are of the same type Crane uses. It’s a reference to a style or type, not a reference to who the supplier is.
I did some considerable research on this topic recently.
The “Crane O Ring” is made of a material called Viton (per Crane) which is much more robust than any other rubber O ring you can buy in a hardware store. I go 100 at www.smallparts.com for around $7.00.
After experimenting with them in my 16" MRP, they actually applied too much extraction pressure and caused several FTE’s. I went back to what LMT recommended which was the standard Mil Spec Extractor Spring with the Black Extractor Insert and NO “O” Ring.
Everything runs 100%…Again.
Lesson learned…the Reliaability package is for shorter barreled systems (< than 16") or suppressed weapons.
Tack
ALL LMT bolts include a crane o-ring installed on the extractor spring.
Did LMT tell you to remove it?
The main purpose for the o-ring is to aid extraction in carbine gassed barrels.
As your MRP uses the mid-length gas system, I can see why it would not be necessary.
I have also found times where an o-ring caused problems on mid-length and rifle-length gas system guns.
What have you seen? Several torn case rims and failed extraction.
I’ve wondered about too much extractor tension, especially when variables combine.
Crane does not make the O-Ring. I buy directly from the company that makes them for Crane.
C4
It is very possible to have too much extraction and actually lock the case into the bolt. This creates some SERIOUS malfunctions.
C4
I have seen extractors that would not snap over the case rim in rifles.
I have seen cases stuck in the bolt face as mentioned above by Grant.
In both cases, removing the o-ring fixes the problem and that’s why I attribute the problems to the addition of the o-ring and resultant increase in extractor tension.
We need to keep the whole “extractor tension” issue in perspective.
This is a CARBINE thing, not an AR-15 thing.
Rifles and mid-length guns have slower carrier operation.
And on the ocaisions that the o-ring caused a problem, other springs were also found to be worn out as well.
The o-ring will usually not cause a problem if other springs (ejector & operating) are in good shape.