HK21 Pad, # 17 Locking Piece, Springfield Trigger
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Thread: HK21 Pad, # 17 Locking Piece, Springfield Trigger

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    Default HK21 Pad, # 17 Locking Piece, Springfield Trigger

    So I just got a chance to try my PTR91 GI with the mods listed in the title (HK21 Pad, # 17 Locking Piece, Springfield Trigger), and man, what an improvement! That said, I am now starting to read about other folks having issues with the #17 locking piece. My gun runs fine, ejects reliably and is very soft shooting. BUT, am I hurting it with that #17? I'm not sure how to measure bolt gap, and folks have claimed that installing a #17 in their gun caused it to open up out of spec. Can someone 'splain how to check that, and if folks have direct, firsthand knowledge or references to negatives on that #17 mod, please advise.
    Obviously, if it's not hurting my rifle, I'd like to leave it in. The reduction in felt recoil is amazing. Brass is still launched with vigor.

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    Crimedogs, you posted two links to your iTrader page.
    Government exists to protect us from each other. Where government has gone beyond its limits is in deciding to protect us from ourselves.
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    Quote Originally Posted by Steve_in_29 View Post
    Crimedogs, you posted two links to your iTrader page.
    Hey thanks,
    I dont know how that happened.When I open the links they went to the relevant content from older posts.I need homework assignment on posting

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    Quote Originally Posted by Steve_in_29 View Post
    Crimedogs, you posted two links to your iTrader page.
    Yeah, I've gone to them several times each, but they don't seem to help...

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    Quote Originally Posted by OMCHamlin View Post
    Quote Originally Posted by Steve_in_29 View Post
    Crimedogs, you posted two links to your iTrader page.
    Yeah, I've gone to them several times each, but they don't seem to help...
    Sorry,will send pm with links I found

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    Crimedogs, thanks for the PM'ed info, I think I am all set now. I measured the bolt gap and it seems good, with a .017" as go, and a .018" showing as a no-go. I was slightly confused as to the referenced poster saying that the bigger the gap, the less the wear, but I guess I just need to read up on that and figure it out. The #17 locking piece will stay in for now, as ejection is solid and I swear, I believe recoil is reduced a noticeable amount.

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    I've heard folks say that the LP tames recoil even more effectively than a bigger buffer. Personally I enjoy getting slugged in the shoulder.

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    Quote Originally Posted by OMCHamlin View Post
    I was slightly confused as to the referenced poster saying that the bigger the gap, the less the wear, but I guess I just need to read up on that and figure it out.
    As components wear on an HK roller locked weapon the bolt gap always decreases over an extended period of rounds. It is possible to run a firearm down to no bolt gap, but often failures will begin to occur before that.

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    Quote Originally Posted by rickj1nd View Post
    As components wear on an HK roller locked weapon the bolt gap always decreases over an extended period of rounds. It is possible to run a firearm down to no bolt gap, but often failures will begin to occur before that.
    Actually, maybe I DO understand; a gap there, means tighter headspace because the bolthead is sitting farther forward, is that sorta in the right ballpark?

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    Quote Originally Posted by OMCHamlin View Post
    ...means tighter headspace because the bolthead is sitting farther forward, is that sorta in the right ballpark?
    For the most part, yes... You got it.

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