hk 91, g3a3, cetme, ptr 91 head space (bolt gap)

07-20-2009, 10:04 AM

festus

Join Date: Jan 2008

Location: Florida Panhandle

Posts: 1,682

hk 91, g3a3, cetme, ptr 91 head space (bolt gap)

1. let the bolt and carriers snap fwd on an empty chamber
2. set weapon to fire
3. pull trigger
4. measure gap between bolt head and bolt carrier Should be .004-.020
5. change rollers to obtain correct gap

Caution...some rifles built on parts kits have a ground head to give a false gap. If the head has been ground in any way replace the head and readjust the bolt gap to .004-.020

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hk 91, g3a3, cetme, ptr 91 head space (bolt gap)

1. let the bolt and carriers snap fwd on an empty chamber 2. set weapon to fire 3. pull trigger ...