tricky9914 Posted February 6, 2021 Report Share Posted February 6, 2021 (edited) <p>Hello!<br />So, I posted here several months ago that I got a transferable Breda 30. It is a Costa Rican contract firearm as noted on the receiver. It is also marked on the receiver as 7mm... On the form 3 it is listed as 7mm...</p><p> </p><p>Now, I just got around to getting it "range ready"... I discovered that the barrel and bolt are 6.5. This was a rewat so my assumption is the original 7mm barrel was plugged so the person who restored it just replaced the barrel and bolt with more readily-available 6.5 parts. The barrel was still packed in cosmoline, so I assume it was not fired. Question: is the conversion from 7mm to 6.5, just a barrel and bolt swap? Are there any other parts I should check? The gun does not have the oiler top cover, but I can apply oil by hand before loading. </p><p> </p><p>Thanks for the help! <br /> </p> Edited February 6, 2021 by tricky9914 Link to comment Share on other sites More sharing options...
BillyDixon Posted February 6, 2021 Report Share Posted February 6, 2021 take it out and try it, then report back to us,, just sayn Link to comment Share on other sites More sharing options...
tricky9914 Posted February 6, 2021 Author Report Share Posted February 6, 2021 Honestly, I'd rather hear from someone who understands the weapon system first, so I don't blow up my gun... Or my face... just saying :-D Link to comment Share on other sites More sharing options...
BillyDixon Posted February 7, 2021 Report Share Posted February 7, 2021 this may be a case that no one has encountered before, so gun was a reactivated 7mm, useing a 6.5 bolt and 6.5 barrel , did the person you get it from ever shoot it ? did they tell you about the mix up parts when you bought it ? just wondering not trying to heart your feelings,, i think about 100 of the 7mm were imported back in the 60s by sam commings , the s.n.s were all 2 or 3 digit, i had one in the 80s , it was welded up so heavy just sold off as a decorator, Link to comment Share on other sites More sharing options...
Black River Militaria CII Posted February 7, 2021 Report Share Posted February 7, 2021 I have a Costa Rican 7mm example as well as a 6.5 and will check to see the fit of the 6.5 barrel in the 7mm receiver. The rule of thumb with receivers built for a barrel of one caliber that can also accept barrels of a different caliber, is that the the different caliber barrel will not headspace correctly or actually lock in place. This prevents the different caliber barrel from actually being able to fire a round. Link to comment Share on other sites More sharing options...
tricky9914 Posted February 7, 2021 Author Report Share Posted February 7, 2021 Thanks for the response, Bob! I do have the original (numbers matching) bolt for the 7mm Breda. My assumption is the original barrel was plugged and welded to the gun. I did get a parts kit with it, so the parts kit (barrel and bolt) was likely used as a donor to the Costa Rican gun, leaving it in 6.5. Since the 7mm barrel was likely destroyed. The barrel is indeed a loose fit, but it does lock in place. Do you happen to know of a source of 7mm Breda barrels? Thanks again for your response and for testing your examples against this question. Link to comment Share on other sites More sharing options...
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