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Thread: roller size advice

  1. #1
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    roller size advice

    hey all,
    My CETME has a bolt gap of .008, I want to buy some oversize rollers and get open a little wider. If it were yours what size would you buy?

    Thanks,
    Brian

  2. #2
    Senior Veteran bladeworks123's Avatar
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    If you stay with your existing bolt head and locking piece, I would try + 4's... A new bolt head and locking piece might get you even more. Trying the plus 4 rollers at first is an inexpensive trial.
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  3. #3
    Senior Veteran HKaltwasser's Avatar
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    If you have standard rollers in then + 4's should bring you up to about .016". I believe for every size increase gap goes up by .004". With 016-.017 is preferred sweet spot.

  4. #4
    97th Signalman's Avatar
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    I would certainly start out with plus fours like the others said. They are cheap and easy to replace. You might want to order the little pin that holds the roller retainer in place just in case you loose or damage yours. I would also order a spare retainer plate. Even if you don't need them anytime soon, it's always great to have spares on hand.

    97th Signal Bn, 7th Army Main Communications, Germany, 1960-63

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    awesome, thanks guys!

  6. #6
    Veteran lakeracer69's Avatar
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    Definately go with the plus 4's. It wouldn't hurt to mic one that is in there now before ordering new ones.

  7. #7
    Veteran thedave8's Avatar
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    Quote Originally Posted by lakeracer69 View Post
    Definately go with the plus 4's. It wouldn't hurt to mic one that is in there now before ordering new ones.
    yeah, they might already have put plus sized in it to get to .008......hopefully they are stock 8mm

  8. #8
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    well they have no markings so I am assuming that they are not plus sized; though I realize that they might be. and It started out at .011- it just shrunk up a bit in the last 500 rounds or so.

  9. #9
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    Never assume! Buy a digital micrometer from Harbor Freight Tools or elsewhere. They're about $15-$20 for a 6" mic. I find it extremely useful & it removes all doubt.

  10. #10
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    I actually have a caliper, but maybe that's not accurate enough. Anyhow I think I will just buy the +4's (cannot hurt to have them around) put them in the rifle and make a measurement. I also need to buy some other stuff anyway (I somehow lost the windage screw for my rear site and grip screw during the refinish project, not sure if it fell out or if my 2 year old got hold of it- suspect it fell out somewhere- noob mistake). So I may as well make the order worth it and buy some spare parts plus the rollers and the screws I lost.

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