Its a Spyder clone only in a pistol. If you don't want to sharpen the sear you can get another at your local shop or on ebay for a couple of bucks. You can also look for an electronic grip off a Spyder clone.
Also check to see that the o-ring on the front of the bolt is there and in good shape. A lot of the time someone lubes it with WD40 and destroys all the O-rings. ATF transmission fluid is a cheep O-ring friendly lube.