After years of running my TM MEU magazines with little-to-no maintenance and even less lubrication, my magazine top gaskets were starting to wear down and/or tear. This was causing some extra gas consumption due to leak of gas coming out from the cracks and gaps in the rubber, and hence I decided that it was time to rejuvenate them.
I went with Guarder’s seal replacement part in the end since it was easiest to find (in significant quantity) for the 1911 series. The little bit of information I managed to dig up on them on the interwebs basically said that these are primarily a replacement, not an upgrade. Still, these are easier to acquire as compared to the Marui original part, so I decided to give these a try especially for the cheap price that they go for.
Do note that the Guarder rubber seal (left) is slightly taller in height than the Marui (right); it fits just the same though. No effects on gun function so far as I can tell.
Result – mags work as good as new now with the Guarder rubber (left). Appears to have same performance as undamaged original TM gasket (right), as far as I can tell without actually running chrono test to get accurate reading of output.