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I couldn't find the answer through search but are all the parts of an m14 interchangeable? I read somewhere that you had t do something special if you swapped out certain parts like the trigger group or bolt. some incite would be appreciated
 

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never swap bolts out unless you can verify the headspace is correct and safe. Trigger groups and sights will probably be ok on standard rifles, but sight fitting and rebedding the trigger group may be necessary with those parts. Chinese rifles use different threads in the gas system than US rifles. A Chinese gas lock must be used with a Chinese barrel, but the other gas system parts should fit ok.
Many times some minor fitting will be needed for best fitment and accuracy. Again, do NOT just swap bolts out without verifying correct headspace first. If you are not familiar with the M1A/M14, I suggest letting a M14 armorer or smith that is familiar with them do the work for you.
 

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Normally yes, as long as everything is in spec. it should be fine. but, do a full function and safety check to be sure it functions as it should, the safety works correctly, and the hammer does not follow the bolt back down. The safety check procedure should be in several threads on this forum and in several field manuals.
 

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Every match-tuned trigger group has been worked on to bring a particular barreled action and stock - especially stock - to 4 or 4.5 lbs trigger weight and a quick re-set for shooting in rifle matches. It's not advised to be swapping these in/out of multiple rifles. Unmodified USGI trigger groups can be swapped around without risk of doubling.
 

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Every match-tuned trigger group has been worked on to bring a particular barreled action and stock - especially stock - to 4 or 4.5 lbs trigger weight and a quick re-set for shooting in rifle matches. It's not advised to be swapping these in/out of multiple rifles. Unmodified USGI trigger groups can be swapped around without risk of doubling.
Very good point. If you do a swap, do a safety check procedure. They are free but may save you much trouble.

An alternative to a complete swap is to just swap out the trigger groups internal parts for usgi parts. Most commercial trigger housings are fine, the weak link is the commercial hammer and trigger/sear. But, there are some commercial housings that are to bad out of spec and should be replaced, these seem to be somewhat rare today but it happens.
 

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Another reason for not switching M-14 bolts around besides just head spacing issues is bolt lug engagement. You do not want just one of the bolt lugs carrying the entire load, since the opposite bolt lug may not be engaging the receiver.

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