I purchased this little puppy brand new last week and have put 250 rounds through it as of today (four trips to the range). Six rounds of the 250 have failed to eject properly (I had three today of 56 rounds). Is this normal for this gun at this level of "newness"? I cleaned and lubed it only once right after the first 50 -- I have not done the fluff and buff. I'm wondering if the three failures I had today were due to the gun being dirty? It's not a target gun -- self defense only -- so I need to count on it firing when I pull the trigger. Thanks.