Questions for the rech savvy, HK91 Bolt Rollers
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Thread: Questions for the rech savvy, HK91 Bolt Rollers

  1. #1
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    Default Questions for the rech savvy, HK91 Bolt Rollers

    I have a Michaels Machines converted PTR91 to HK11 that I use for blank fire. The gun, like other ptrs and hk91s, does not cycle blanks amazingly.

    It was recommended to me that I remove the rollers and use a larger BFA by reenactors that use MG42s.

    This is scary as the gun was pricey. I know there are different rollers you can place that effect the +/- gap.

    Is there a small roller that provides less resistance than a standard bolt?

    If so is plus size more resistance and smaller less? Sorry for the stupid question.. Don't want to kill the rifle.

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    Maybe call Mike with that question...

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    You can ping him on this forum @hk21man
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    For blank firing, wouldn't you need something like the UB Training bolt, which has no rollers at all? I know you do for the DAG training ammo and the blank ammo is pretty similar (if its the plastic stuff).

    Last edited by Beowulf; 02-11-2019 at 04:12 PM.
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    If I were going to do what you are asking (on my own gun) I could think of two different ways to do it.

    1) you would try larger rollers, not smaller. The larger your bolt gap is, the sooner it opens.
    2) If you don't want to mess with the rollers, buy an extra bolt locking lever spring from Apex because their springs are already significantly weaker than a real HK spring. It it doesn't solve the problem by itself grind a little off the length and try it again.

    The problem with each solution is you must change back to the original configuration before live fire or you will damage the weapon. Ideally you'd have either a dedicated bolt head or dedicated carrier for blanks and one for live ammo.
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    Quote Originally Posted by tenhunter View Post

    Is there a small roller that provides less resistance than a standard bolt?
    you need a higher angle LP

    you might also add a BFA to the barrel/flash hider like they do for movie gun, BUT you better make sure and never shoot real ammo with it installed.
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    @Beowulf I had one of those, it did not work with standard blanks. I think it is designed for blue DAG someone told me?

    @Holescreek Good ideas.. Makes sense.

    @TaylorWSO I have 20+ BFAs, all of these G3 style rifles are not friendly with blanks due to the roller lock design. It fires, sometimes I can get through a couple of mags with no issues depending on the power of the blanks. Also I wrap the pistol grip with red tape when the gun is set for blanks.. super cautious. I like my hands where they are! Also what kind of locking piece would I need, not sure I have heard that? I did have strike issues with a binary trigger so there may be something there.

    OH and I will reach out to Mike as well, the blank stuff was not his wheel house.

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    I've run into heat causing problems with the blue training ammo, it doesn't take a whole lot of shooting for the plastic to get hot enough to deform and/or stick in the chamber. Have you noticed any oddities in the fired blank hulls?

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    I have fired a lot of the black plastic blanks.. They start to melt after 60 or so. Had one go off in the chamber once of a PTR91.

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    quite a few of the movie guns had a plugs that screwed in at the end of the barrel with a small hole through it. This allowed the weapon to look like a factory firearm but allow the weapon to cycle blanks.
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