Works great with the stern defense 9mm adapter, bca 9mm upper and ar15 lower. - Kaw Valley Precision Solid Stainless Steel Heavy Buffer

I bought an Bear Creak Arsenal 9mm complete upper which is a blow back bufferless upper that came with THEIR weightless buffer. I also bought a Stern Defense 9mm Glock adapter and works fine BUT there was no Last Round Bolt Hold Open (LRBHO). When contacting Bear Creek Arsenal, they said that their 9mm uppers do not have a last round bolt hold open with their bufferless uppers. WELL, that ain't true. I recommend filing their weightless buffer that came with the upper into file 13 (trash because it is worthless) and install this buffer from Kaw Valley Precision. Went to the range and it works great and now I have LRBHO on the last round. No more issues and I highly (did I say, HIGHLY) recommend this when using a BCA 9mm bufferless complete upper with a Stern Defense 9mm adapter to run your AR15 using Glock 15,17, 33 round magazines or Magpul magazines up to 27 rounds. You will thank me so buy this to finally get your LRHHO on your 9mm upper.