STI .22 Cal. Conversion Unit for 1911 ACP with Marvel Insign

Don Weihl · Post by **Don Weihl** » Tue Jun 22, 2010 4:59 pm

Does anyone have experience with the accuracy of the STI .22 Cal Conversion Unit?

jackh · Post by **jackh** » Wed Jun 23, 2010 8:24 pm

The STI appears to be every bit of an Advantage Arms unit. I have ransom tested my Advantage Arms 1911 target unit at 50 yds. Eley Tenex was very good at about 1" groups. More mainstream ammo like Aguila SV, Eley Sport (purple) grouped about 1.5". One surprise was CCI SV which grouped terrible at 3"-4". The CCI test was repeated.

Seek out a Bob Marvel/Advantage Arms unit. They are probably the best.

TonyT · Post by **TonyT** » Tue Jun 29, 2010 3:37 pm

I have one of the older Marvel units on a 1911 frame. It will group sligtlly under 1 inch at 50 yards with Wolf match Extra.