would this work on an Extar EP9?

This is designed to allow mounting of AR stocks on Galil/ACE receivers and isn't going to work for what you're looking for unfortunately.

it will fit any gun that doublestar makes a base for " Folding Mechanism with integrated AR15 type Stock interface. Now any AR type stock can be mounted on any receiver block that ACE makes. This includes collapsible and fixed length stocks." Please contact doublestar and see if they make a base for the Extar EP9 DoubleStar Corp. Tel: 859-745-1757 Fax: 859-745-4638

DoubleStar offers this adapter in 2 versions, with and without the 'Boss', The Boss is the raised (oblong shaped) portion on the Arm (small side), designed to integrate with their proprietary AK receiver block. Versions without the Boss have a flat back, making them work with all other receivers. The picture of the product on the product page does show the Boss, but I want to be sure. Thanks Bud's Item Number: 711013822 | UPC: 736211128775

This UPC code references "With the BOSS" Chris. I would still contact Buds for confirmation via LiveChat (available from 9AM to 9PM 7 days a week), the "Blue Chat Now" bottom at the bottom right of the page at 9 CST this morning, or phoning at (859) 368-0371 (available 9AM to 9PM EST Monday through Friday).

you will need to Contact Buds at 1-859-368-0371 9am-9pm EST Mon-Fri. or use the Blue Chat now button because either the PN or the upc is incorrect on the doublestar page the A504 is for without Boss and the A504-K is for with Boss https://star15.com/catalogsearch/result/?q=a504

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Ace Folding Stock Mechanism With Integrated AR-15 Stock Interface Black

Name: Ace Folding Stock Mechanism With Integrated AR-15 Stock Interface Black
Brand: Doublestar
SKU: 711013822
Price: 63.99 USD
Availability: InStock

Reviews| 2 Questions & Answers

Model: A504

Condition: Factory New

Bud's Item Number: 711013822

UPC: 841348100737

MFG: Doublestar

Questions & Answers (2) Reviews 0 out of 5

Ace Folding Stock Mechanism With Integrated AR-15 Stock Interface Black

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Folding Mechanism with integrated AR-15 type Stock interface. Now any AR type stock can be mounted on any receiver block that ACE makes. That includes AR15, A1 or A2 stock, AR stubby stocks, ACE ARFX-E, M.P. PRS, etc. Black

Doublestar Ace Folding Stock Mechanism With Integrated AR-15 Stock Interface Without Boss