Its great! it solid too - JMac Customs Buffer Tube Adapter for 4.5mm Folding AKs

I love it, for my PSA AK-104! It needs to be filed or the latter lightly dremeled to fit mine. IT needed to be dremeled top and bottom of the part that would make contact right where the pin is put in. now also the pin needed to be fit to install partly because of the jmac piece and partly of the PSA 4.5mm pin. tapping it in with a hammer and when it stops moving punch it back out and lightly sand the section that got stuck and repeat.