hk 91/g3

[mikillium]

anywhere i can send a g3 to have the barrel pulled off and put back on to fix a head space problem.gun functions 100% but ejects brass 45 to 50 ft away which is cool but im afraid of excess chamber pres. crackin bolt or trun.

[TrippHammer]

Mike Woodward at TSC does a great job
804-994-9999

Terry Dyer also does a great job, but I think he's pretty busy all the time.

Mike is highly recommended.

good luck

[eyegun]

What is the bolt gap?

Before sending it off, check the gap. It's probably zero. You can reset it by replacing the rollers and/or locking piece, saving yourself a couple of hundred $$.

[r]

mine has thrown 308 brass 35ft forward at about a 45 degree angle from the shooter since day one. i doubt you have anything wrong at all. maybe just a 91 that has no seen a lot of use.

[ARDOC]

check your headspace before sending it in. Also I as eyegun said you can change out the rollers. You can buy them and the locking piece from Gordon Miller or RTG.

[sig-x]

My HK 91 throws the brass pretty far as well.

[mikillium]

i think the head space is off because when i pull the cocking lever it doesnt unlock the bolt.i have to pull back on it hard and fast to get it to unlock.whats the best way to check it without the guages,and what should the head space be?There is no sign of stress on the brass.should i even worry about it? Thanks for the help.

[r]

try http//164.58.173.38/hot51/hot51.com/

look under HK101 and read the section on checking headspace and look also under pictures (have feeler gauges at the ready)

[MarkV]

also try http://www.robertrtg.com/g3QA.html usually has some good info. try the fifth question down before sending it out.

i know my 91 sure flings the brass. fortunately POF started selling port buffers again because the HK ones were unobtanium for a while... but 45ft seems pretty far. you can't be no sissy cocking it either.

[Lima]

+ 1 on check bolt gap and replace rollers if needed. No need to pull the barrel.

Curious, when you pull back cocking lever, does it act like a cam to unlock the bolt or are you manually exerting the pressure to unlock the bolt? The cocking lever cam action should be doing most of this work for you. May need to shim the cocking lever if this is the case.

[mikillium]

it starts to unlock at first but not enough to disengage the bolt.How do i go about to shim the cockin lever.

[Trigger]

before you start shimming find the gap in your cocking lever. I don't think you have a head space problem. I have 2 hks a G3 and 51b both guns hurl the brass 30 to 40'. Your cocking tube support may be to short. Look over the assemble over throughly see if the pin on the lever, lever or tube support has wear then look at the end plug for wear or if it is lose or cupped to determine what is causing the excesive gap.

[mtdew]

http://www.uzitalk.com/forums/showthread.php?t=31109

I doubt it's bolt gap/rollers. The charging handle cams aganst the cocking tube. If the cocking tube is too long (common if you dont get all of the orig rec stub off) the camming action is lost. When that happens you have a rifle that takes 50lbs to cock since you loose all your mechanical advantage.


When you pull the cocking handle out to 90° that action is supposed to push the bolt back far enough to allow the rollers to unlock.

The bolt takes say 50lbs to move the first 3/16" (unlocking) and only say 10lbs to overcome the recoil spring after it's unlocked. The design of the cocking handle is a lever. If the pivot point is off (just a bit forward) you end up loosing the full throw of the lever and have to overcome the rest of the 50lb by hand.

am I making sense yet?

The bolt is supposed to be that hard to move. The leverage of the cocking handle overcomes the inital "lockup" resistance

to test it out add a washer between the bolt carrier and the cocking handle support to close the gap. that should make it function correctly (dont shoot it that way)