AR Sponsor
Posted: 4/3/2017 10:01:21 PM EDT
I just got this BCG and does the gas key looked stacked correct?
|
|
Quoted:
Looks just fine to me, I don't quite understand why so many are so worried about how gas keys are staked these days, we keep seeing posts about it, but as long as it displaces the sides into the screws, it is staked correctly. 
In the wrong internet forums. |
|
Just how many screws have we seen that have loosened up?
I have seen a few posts where they have cracked or broken, but I can't recall any where an intact screw loosened up and cause problems. And incidentally, over-staking probably causes more problems (cracking the screw) than under-staking. |
|
Quoted:
Looks just fine to me, I don't quite understand why so many are so worried about how gas keys are staked these days, we keep seeing posts about it, but as long as it displaces the sides into the screws, it is staked correctly. 
|
|
Quoted:
Just how many screws have we seen that have loosened up? I have seen a few posts where they have cracked or broken, but I can't recall any where an intact screw loosened up and cause problems. And incidentally, over-staking probably causes more problems (cracking the screw) than under-staking. |
|
With all the reports of problems it seems legitimate that someone new to the platform would question the staking.
I would presume that over tightening or improperly staking a hardened screw could result in a cracked or broken screw. I am always careful to evenly apply pressure to my tool’s staking screws and not get carried away. |
|
Quoted:
Just how many screws have we seen that have loosened up? I have seen a few posts where they have cracked or broken, but I can't recall any where an intact screw loosened up and cause problems. And incidentally, over-staking probably causes more problems (cracking the screw) than under-staking. |
|
Quoted:
OK, that's one out of how many? I don’t recall that they said how many, but the tech note is probably still on their website. |
|
OP, that staking is just about perfect. You'll find tons of pictures of keys staked anywhere from "too much" to "why did you bust your key that way?" ALL you need is to displace metal from the key into the knurlings of the key screws.
Do you need it? I think so.. Why? Because that's how the component is designed to be assembled, and if done correctly, it works very well. |
|
Quoted:
OP, that staking is just about perfect. You'll find tons of pictures of keys staked anywhere from "too much" to "why did you bust your key that way?" ALL you need is to displace metal from the key into the knurlings of the key screws. Do you need it? I think so.. Why? Because that's how the component is designed to be assembled, and if done correctly, it works very well. |
|
Quoted:
I don't doubt that it needs to be staked, I just wonder how many 'staked' screws have unscrewed? UNstaked screws will loosen. Murphy's Law says that will happen at the clutch point in a competition, or worse. While there's no force that directly would cause them to loosen, the variety of forces applied, (I think especially thermal stresses) will allow the screws to become loose. Once they're no longer torqued, they'll essentially just wiggle out because of the carrier's movement in the upper. Screws that were obscenely staked with some sort of demon-possessed tool CAN loosen because the key can fail due to too much material being displaced, weakening the key. |
|
Had it happen to me... Improperly staked, factory rifle.
Fortunately for me it was at the range, and not out conducting business. Not that I would actually ever buy that brand, or even use it for business. I would like to try a Voodoo Innovations bolt carrier, but it seams like that product doesn't actually exist. Site says backordered 8+ weeks, and it has been that way for a loooong time. :( |
|
Quoted:
As GHPorter pointed out "unstaked screws will loosen". Due the the vibration on the M231 Firing Port weapon, they required roll pins installed to keep the screws from coming loose. http://i135.photobucket.com/albums/q125/PursuitSS/Mobile%20Uploads/2013-12/872B86C2-7275-40DC-9AD8-CEEC6F4330BE.png My question was, how often do we see events as described by MrWillie? That is, something that was apparently staked by the factory (or individual), but loosen up during use? I'll wager it is far less common than the opposite case where overly aggressive staking has causing cracking in screws. |
|
Quoted:
I'll wager it is far less common than the opposite case where overly aggressive staking has causing cracking in screws. |
AR Sponsor