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Here is a hypothetical question to all experienced professional custom gunsmiths.
I am just wondering has anyone ever tried the idea of internally threading a trunon?
Obviously the barrel needs this as well.
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Extend the barrel threads beyond the trunion area and use a nut to secure. FN did that with the FNC and look at the savage rifle design.
challenge will be to maintain the clearance for the cocking tube pin slot as well as the front of the trunions do not provide a significant shoulder (given the relief undercuts for forend)
Was thinking of how the Savage rifle did the bolt action ... but one of the primary reasons for much of the construction of sheet metal MP43 and G3s was to keep the cost and manufacturing effort down.
How did you adjust bolt gap / head space ... chamber afterwards or just do it correctly to start ;-).
threaded to the bolt gap spec .. and then adjust with rollers
Notice the thin support on bbl flange to trunnion - not best for accuracy... they got it right the manner which they produced them.
Interesting photo. Did you make this? How old is this, I see surface rust? Was it ever used?
I was thinking to use a psg-1 trunon to solve some issues. Also use a finer thread with 2 or 3 lands, then in your photo. I haven't had any more ideas about head space adjustment, other then to have it machined into the barrel/trunion, or to use a double nut to lock the barrel (but this would not promote accuracy). The cocking tube hanger could be eliminated by using the psg1 trunion and attaching a forgrip of similar design to the all aluminum UTG tri-rail for the g3. Then just anchored securely to the extended trunion. My XLR chasis for my long range target rifle works like this.
I thought it would be interesting if you could make the G3 a swap barrel, disregarding the practcal side of why.