Was expecting to need to ream the main gear mounts and legs 'in assembly' to get a perfect fit but discovered that it needed only to be deburred carefully and the AN5 bolt fit perfectly.
The bolt grip seemed a smidgeon long and might catch the first thread of the locking nut. Added a washer under the bolt head to compensate while maintaining plenty of threads through the nut.
Was prepared to ream the hole to 5/16" (0.3125) but the AN5 was 0.3090 and there is no wiggle-room or undue resistance to insertion.
Other misc tasks preparing to move fuselage to hangar.