gonna do gun #3 originally planning on delrin track from catalog fitted into a dovetail groove in 5 piece laminated teak barrel, but on my last batch of guns , i ran short of teak, so i experimented using slices of "IPE", (brazilian walnut) i have on my costruction job. According to some , I was going to have a problem possibly because of the different densities of the two different hardwoods or some thing like that. NOT TRUE not in this case, anyway. i put the IPE in a centerlaminate on one barrell , and now the track ,(not enclosed, incidently) is REALLY slick and hard!! way harder than teak! also , ! it is super dense and hard. the problem is that , it sinks, only slighly >buoyant, though, so with 50% teak, will float. they suggest in the catalog for the plastic barrel, that wooden , enclosed tracks wont stay true ,over time, Is this true? i bet it would if i used ipe for track. Anyone ever installed one of these before?