well a friend knock off my RRA lower off on the floor from 3’ table . two parts broke their were front pivot pin and bolt catch -both showed that over hardening was the trouble and broke like glass ! ok now background of what happened ,now who made the parts for RRA ? how many more makers not testing the specs of thier parts ?and who is is testing them ? hardens them right?
CMT manufacturers RRA lowers and internal parts.
The “ears” on the lower that the pivot pin and bolt catch roll pin pass through broke or the pivot pin and bolt catch themselves? Either way bummer, but shouldn’t be so bad if it was just the catch and pin.
-RD62
I saw a fully assembled RRA lower at a local gun shop whose bolt release tab had sheared off. It was sitting right there in the case. I pointed it out to the salesman behind the counter, they hadn’t noticed it. They were appreciative that I noticed it and they removed it from their stock.
Please explain in detail exactly what broke? Can you post pictures?
The front pivot pin or the two ears (loops) on the front of the receiver that the front pivot pin passes through?
Was the front pivot pin extended?
Same thing for the bolt catch. Did the catch itself break or the loop extensions
that the roll pin passes through on the side of the receiver?
How do you know it was from over hardening?
Thank You for any information you can give on this.
more on parts breaking beside the questions . this scares me a bit how many more weapons with same type of parts in them ? how about the military weapons and police ? when you do need the most ,they fail !the quality control is the big question -who make the best and with Q.C. and yes we a sticky post on the small parts which support the weapons function -can somebody do a tests on them for better picture whats out there and what to stay way from and what to use? thank you, you all!
Can you give us some more information?
I’m very interested in exactly what broke, the front pivot
pin itself or the two loops that it passes through?
Did anything on the receiver itself break?
Cheap parts can be replaced.
This does not suprise me.
RRA sources parts from where ever they can get them (as do many manufacturers).
Very few manufacturers are going to be testing the hardness of their parts (FYI).
C4
What a coincidence. My best friend accidentally knocked his complete lower (Anvil receiver, RRA parts kit) off his table. The bolt release tab sheared off. I figured shit happens, but if someone else posted the same thing happened to them and you saw one in a shop with a sheared bolt release perhaps they had a bad run at one point?
Oh. Or I guess this could explain it.
If there is any villian here, it is the forger - probably Alcoa Aluminum (they were one of the largest sources of forgings).
Look, the “hardening” you guys are talking about is a standard SET BY THE FORGER. That standard is “T-6”
ONLY the forging company imparts any hardness on the lower at all.
The manufacturer has NOTHING to do with imparting the “T-6” hardness level. I know because I have built lowers from raw forgings - from raw, 0% to fully anodized. All we do is mill them to spec and anodize - that is it.
Now, when forgings are sold, like any metal stock, they are “certified” as being whatever standard they claim to be - in this case either 7075 T-6 forged aluminum or 6061 T-6 aluminum (I have seen both).
Could the forger have fudged the certification? Sure could. That is how Harry Truman got elected (insufficiently hard ship armor in WWII).
But, do not point any fingers at the manufacturers; if they were all going to hardness test anyway, then WHY would they pay for certified alloys in the first place?
Not the receiver, the bolt release. 
No one is talking about the lower receiver. The front pivot pin and bolt catch broke.
That’s what I wanted to know. Thank you.
So, just replace those two cheap parts
and keep on shooting.
I’ve never heard of any receiver breaking like that.
Correct: bolt release broke - NOT the tabs (which are part of the lower forging).
Just making sure that no one is avoiding RRA lowers or CMT lowers - as both are mentioned in this (quite unclear) thread. Carry on.
and this, my friends, is why a high-quality LPK is worth it- well, to me at least.
Me, too. These are not parts I carry in the VFG.
front pivot
pin itself was locked out as you remove the upper from lower. but bolt catch in half the part holds the bolt open when the mag is empty-rest on the lower…no other damage !
They were talking about pins… but regardless, the “T” is for the tempering of the aluminum. Its the specification for tempering. 7075 T6 is aircraft aluminum with a “6” tempering which controls the tensile strength of the material. There are several levels of tempering.
I find it interesting that it is the bolt catch breaking since the few rock rivers I have seen had the bolt catch with no casting seam, which I thought was supposed to be better. I guess I’ll have to wait for grant to get his lpk’s back in stock as well.