Simple but effective.
This item replaces the bold hold open part on the lower. The bolt/carrier must be seated in the barrel in order to break the upper and lower to change the magazine as per the new California gun regulations. A bolt hold open capability just adds another step to the magazine change will not be missed. I tried this on a poly lower(vortek) and the lower flexed enough to prevent an effective lock on all of my various magazines. that did not occur with my forged metal lower and with a little fine tuning with a file, it worked great. Unless they are aware, most will not even notice the modification. I would have given this 5 stars if the device was finished in black and the hole for attachment was a little tighter with less play. A great simple way to address Sacramento's complex obsession with controlling the AR-15.
Reviewed by: Ojai_guy from Ojai, CA.