interesting. i just read this on gun-tests.com about the sig sauer mos-22 pistol. OOB right out of the shoot (pardon the pun..)
The Mosquito was then returned to service. It was still experiencing intermittent problems when a premature detonation occurred. The round went off with an open breech, creating a notable flash and popping sound. Smoke belched from the muzzle, breech, back of the slide, and the magazine well of the Mosquito. Our tester was hit with particles on his unprotected forehead but was uninjured. We retrieved the ruptured case along with a small brass fragment, reviewed the incident, and closed our evaluation according to Gun Tests review policy.
Later, we spoke with Eric Vonbosse, Product Manager for Sig Sauer, regarding our Mosquito's malfunctions, and eventual catastrophic failure. He offered some insight into what might have caused some of our problems.
Apparently, the German-manufactured Mosquitos have had chambers that were manufactured to a 22 Match CIP specification. There is a tolerance difference with the SAAMI 22 Long Rifle specification that can cause an overly tight fit with 22 Long Rifle ammo. As a result, rounds fired in the gun could stick in the bore, causing failures to extract. Mr. Vonbosse explained that they had addressed the situation with their German factory, and that their Service Department now routinely checked the bore sizing in all Mosquito's sent to them for repair. When an undersize condition is noted, a finishing reamer is used to bring the suspect chamber into specification.
Mr. Vonbosse could not provide a ready explanation for the catastrophic failure, however, instead directing us to send the gun in for their Service Department to examine. We'll report the results in an upcoming issue.
Our Team Said: Don't Buy it. We canceled any further testing of the Mosquito due to safety concerns.
