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Hi Lance, Yes this will fit your Mec 600 Jr, It fits MEC Single Stage Presses-- Please click the green box stating it as the best answer. We are rated on our answers and are just volunteers, not Buds employees. You can choose more then one Thank you!

MEC says it Fits: - MEC Single Stage Presses however, I would verify fitment on the MEC 600 jr due to age with MEC Shooting Sports Customer Service at 1-800-797-4632 or via email at info@mecshootingsports.com

Please click the green box stating it as the best answer. We are rated on our answers and are just volunteers, not Buds employees. You can choose more then one Thank you!

yes the primer seating pad is the same on all of the Mec 600 presses by the way the manufacturer is Mec not Mec-gar they are 2 different companies the link is to the parts list for a mec 600 Jr this is part # 18 https://www.mecshootingsports.com/600-jr-mark-5-parts

James I reload 12,20 ,28 and 410 on Mec reloaders and this part is the same on all of them from the ones II bought in the 70's to my newer ones there is no difference in the primer seat assy

That is correct Randy, same part as in mine too

yes the primer seating pad is the same on all of the Mec 600 presses by the way the manufacturer is Mec not Mec-gar they are 2 different companies the link is to the parts list for a mec 600 Jr this is part # 18 mecshootingsports.com/600-jr-mark-5-parts