Bolt carrier - Page 3
Page 3 of 3 FirstFirst 1 2 3
Results 21 to 23 of 23
Like Tree6Likes

Thread: Bolt carrier

  1. #21
    Very Senior Member

    Join Date : Jan 2010
    Location : Centerville, OH
    Posts : 243
    Mentioned
    3 Post(s)

    Default

    Quote Originally Posted by HD Bee View Post
    The M1 Garand and M14 are headspaced by reaming the chamber also. You could remove the bolt locking lugs and maintain headspace by spring pressure. Just like removing the rollers on a roller locker.
    Are they safe to fire? NO

    I think most gunsmith’s definition of headspace is the bolts free play in a locked position with a cartridge inserted in the chamber.
    With the bolt and carrier compressed the rollers are pushed out by the locking piece and the bolt is temporarily locked in the trunnion.
    Any adjustment by changing the rollers or locking piece would change the free play of the bolt in the trunnion and change the bolt gap.
    But YMMV.
    But this being a blowback action with no locking mechanism means that your definition doesn't apply to this platform. Headspace gauges are of no real use and aren't utilized. Unlike the bolt locking rifles you are referencing these rely on the force of the cartridge itself to open the action. Many DRLB guns have suffered damage from opening too soon but ruptured cases are rare because the entire case is moving at once (thanks to the flutes).

    Any adjustment by changing the rollers or locking piece would change the free play of the bolt in the trunnion and change the bolt gap.
    But YMMV.
    Again, no, and yes. No, the "free play" never changes but yes, the bolt gap does. Look at the way the system is stacked. The locking piece is attached to and rests against the carrier face. The recoil spring pressure forces it into the rollers trapping them between the locking piece shoulder, the front window of the bolt face, and the trunnion ramp angle. The "triangle". No matter what size rollers or which locking piece is used, if there is a bolt gap the bolt head will always stop at the same point. It's what's behind the triangle that changes (bolt gap). It's simple geometry.

    Bolt carrier-2v2haprfgxajwmd.jpg

  2. #22
    HKPRO PREMIUM PARTNER
    HD Bee's Avatar
    Join Date : Jul 2019
    Location : In a TX Hill Country State of Mind. SW of Weird
    Posts : 57
    Mentioned
    1 Post(s)

    Default

    Quote Originally Posted by Holescreek View Post
    But this being a blowback action with no locking mechanism means that your definition doesn't apply to this platform. Headspace gauges are of no real use and aren't utilized. Unlike the bolt locking rifles you are referencing these rely on the force of the cartridge itself to open the action. Many DRLB guns have suffered damage from opening too soon but ruptured cases are rare because the entire case is moving at once (thanks to the flutes).


    Again, no, and yes. No, the "free play" never changes but yes, the bolt gap does. Look at the way the system is stacked. The locking piece is attached to and rests against the carrier face. The recoil spring pressure forces it into the rollers trapping them between the locking piece shoulder, the front window of the bolt face, and the trunnion ramp angle. The "triangle". No matter what size rollers or which locking piece is used, if there is a bolt gap the bolt head will always stop at the same point. It's what's behind the triangle that changes (bolt gap). It's simple geometry.

    Click image for larger version. 

Name:	2v2HApRfGxAjwmD.jpg 
Views:	21 
Size:	99.3 KB 
ID:	258498

    Well I guess the Germans messed up when they called the delayed blowback system a Roller Locker.
    We should be using a different term if it doesn’t temporarily lock until the pressure overcomes the mechanism.


    If there is no bolt gap then the rollers aren’t being pushed out all the way. Which means the rollers aren’t locking.
    Simple geometry.
    Any society that would give up a little liberty to gain a little security will deserve neither and lose both.
    Benjamin Franklin.

    When the going gets weird, the weird turn pro.
    Hunter S. Thompson

  3. #23
    HKPRO PREMIUM PARTNER
    HD Bee's Avatar
    Join Date : Jul 2019
    Location : In a TX Hill Country State of Mind. SW of Weird
    Posts : 57
    Mentioned
    1 Post(s)

    Default

    Quote Originally Posted by Nehalemguy View Post
    You guys are starting to hurt my head space. Yeesh.

    -E-
    If this is hurting your head space don’t even look at the Blish Lock system. LOL
    Another delayed blowback system.
    Nehalemguy likes this.

Page 3 of 3 FirstFirst 1 2 3

Sponsored Links

 
 

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •