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I have never seen a 21FKP and if the anti-glare is all there is to it, It will work the same. A GLASS 21" ROUNDIE PRETTY MUCH WILL WORK IN ANY APP to include replacing a AXP metal. I have used 21FB & J's in place of a 21CY & AX with no problem and good results. FK? Never heard of it or ever saw one. If it was only an anti glare feature, it may have been very late in the game and very few were produced as a selling point replacement. I never saw a production set (or tube by itself) with one and I saw hundreds of roundies when I worked after school in a tube rebuilding plant here in Knoxville, Tn.
PS: ALL 21" roundies use the SAME gun mount. Glass and Metal
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julian
Last edited by julianburke; 08-08-2020 at 01:26 PM.
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