MarcO Posted February 3, 2013 Share Posted February 3, 2013 (edited) I lucked out and ordered a JP 223 CTR upper receiver with the LMOS bolt system about a month before the madness began and received it several weeks ago. I had ordered this upper to replace the upper on my circa 1994 JP rifle that was beginning to shoot a little too loose. I had planned to continue shooting the old upper as a blaster and use the new upper as my new match gun but still using the same lower. Unfortunately for me, the upper does not fit on the old JP lower as the front lug has a different dimension and the receivers will not close. Under normal circumstances I would have just turned around and ordered a new ready built lower from JP but that isn't going to be an option for a long time. I do have another rifle made by LMT whose lower the JP upper fits on and seems to function well with when hand cycled. However, the LMT has a carbine stock and it appears that the required LMOS buffer will not fit in a carbine length buffer tube. So I was going to replace the buttstock but then got to thinking that I might be able to use the bolt that was supplied with the CTR in a standard weight JP bolt carrier (which I have) as an option to replacing the buttstock. My question is do I need to worry about headspacing if I use the correct bolt with a standard weight JP bolt carrier? Or should I just go and get a rifle length buffer tube and a different buttstock? Thanks to all for your input. Edited February 3, 2013 by MarcO Link to comment Share on other sites More sharing options...
Alaskapopo Posted February 3, 2013 Share Posted February 3, 2013 You can use a standard carbine buffer as it has the same mass approximately as the low mass rifle one JP sells. I would just swap all the parts over that you want to use to the LMT until JP is able to help you out in the future. Should not take you too long. Pat Link to comment Share on other sites More sharing options...
rcollier Posted February 3, 2013 Share Posted February 3, 2013 The relationship between the barrel and the bolt itself are what determines your headspace. Beyond that you are free to use whatever components are compatible. Link to comment Share on other sites More sharing options...
P.E. Kelley Posted February 3, 2013 Share Posted February 3, 2013 The relationship between the barrel and the bolt itself are what determines your headspace. Beyond that you are free to use whatever components are compatible. This^^^ Link to comment Share on other sites More sharing options...
MarcO Posted February 3, 2013 Author Share Posted February 3, 2013 Thank you gentlemen! It appears that I have three options. Much appreciated input. Link to comment Share on other sites More sharing options...
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