• The AGN App is ready! Search "Airgun Nation" in your App store. To compliment this new tech we've assigned the "Threads" Feed & "Dark" Mode. To revert back click HERE.

I messed up with my MRod 25

Yes, its the breech O-ring, and you should be able to finesse it back into its proper location by hand or with a small pick. Just be careful not to damage anything. Also I'd suggest picking up some extra o-rings as the next time it happens it could get lost. I don't have the exact sizes for the O-ring on hand, but I know was able to pick up a package of them for my .22 at Home Depot.
 
Yea didnt have many tools seeing how I have them loaned out but luckily had some Allen keys and that's all I needed to get the barrel off and get it back in place. (First time ive ever taken apart my marauder.) Now to testfire it and rezero my scope. After I just spent all weekend to get it driving nails at 50 yards. Ugh such is life. Thanks for the late night response though JD.