HD extractor springs & CRANE O-rings

[M4arc]

Thanks for the scoop Pat!

Sully's running a special on O-rings this month. These are the synthetic versions that are heat resistant up to 400 degrees or so, chemical resistant, no cheapie rubber ones. $1 a piece if you can swing that.

www.defensive-edge.net

Thanks jmart!

I see Sully has received some very favorable reviews in SWAT Magazine so I would have no issues ordering from them and the fact that they are selling them for a $1 a piece makes it a no-brainer

[Pat_Rogers]

Sully is GTG.

[twl]

Yes, we at MGI do have a different view about using the O-ring, but with the small amount of money I make on the D-Fender, I'm not going to make a big issue out of it.
Fought that battle too many times.

Suffice it to say that while the Crane O-ring can be gotten as an issue item that costs a unit nothing, we get orders in the magnitude of thousands of D-Fenders per year from Spec-Ops units buying them for their entire units with their discretionary funding.
They can get the issue Crane O-ring free, but they spend the money to buy alot of our D-Fenders and replace the Crane O-Rings with D-Fenders.
I guess that says something.

Many go to allied military Spec-Ops units as well.

Run what you like, it's your gun.

[jmart]

I just ordered three O-rings from Sully. Unfortunately he doesn't list the HD extractor springs and inserts as separate items, he only includes those with his nickeled extractor upgrade kit.

Does the O-ring work well enough with the std rifle spring/blue insert combo, or to get the benefit do you need to pair them with HD springs? My application would be for a BM 16" Patrolman's Carbine Upper, w/carbine length gas system. If I need the HD springs, where's a good place to get just a couple? If I'm not mistaken, SAW requires a minimum purchase order and I don't think just 3-4 springs would qualify.

[GIFFMANN]

I have a handful of the Crane Springs and O Rings on hand....actually ordered them from Grant in order to have them in stock for folks.

[jmart]

Thanks, I may be contacting you later this week.

In your experience, do you need to run the HD spring with an O-ring or is it just added insurance?

[Aubrey]

An alternative to the SAW spring is Wolff, which you can buy in small quantities from Brownells. You should have the BLACK insert in a carbine.

[jmart]

What barrel lengths require, or are equipped, with the HD/black insert combo? I thought that was the combo to use in anything with a carbine-length gas system, so 16", 14.5" SBRs should all use that combo. I also thought the regular spring/blue insert was std equipment for rifle length gas systems. Am I mistaken?

[Aubrey]

What barrel lengths require, or are equipped, with the HD/black insert combo? I thought that was the combo to use in anything with a carbine-length gas system, so 16", 14.5" SBRs should all use that combo. I also thought the regular spring/blue insert was std equipment for rifle length gas systems. Am I mistaken?

jmart: My BAD. BLACK insert for a carbine; blue for rifle. Edited for correction above.

[M4arc]

Thanks, I may be contacting you later this week.

In your experience, do you need to run the HD spring with an O-ring or is it just added insurance?

In my experience no but it doesn't hurt. If you're running a HD spring and performing regular maintenance you probably don't need an O-ring. But it's extra insurance and that is never a bad thing