They have a web site that you can look it up on, it is at: jack-first-gun-parts.myshopify.com.
I am sure you have their phone #, but in case you don't: 605 343-8481.
They sent my parts out very quickly. They are kind of pricey but they had to make the parts from scratch and the old used parts are pricey too. I was impressed with the quality of their receiver screws which was all I bought from them.