river_boater wrote:45Badger--I disagree, but this brings more questions.
First, all production firearms manufacturers use CNC to machine parts. Unless a part is just poorly designed, I really can't accept that there can be that much difference in fit or finish. Unless the piece is actually designed to fit poorly in it's assembly, I just don't see it happening. Besides, what would be the benefit to machining something to fit poorly?
Not poorly designed (nor designed to fit poorly), but designed to have loose tolerances. It's not done because they can't accurately machine the parts, but because loose tolerances allow it to keep working after you drop it in a mud puddle. There's no free lunch, so there's a price to pay.
http://www.ccfraceframes.com/faq.phpA Glock® is designed and built to extremely loose tolerances as it’s primarily a battle gun, and those loose tolerances are necessary for reliability in hostile environments.
http://jagerproducts.com/index.php?main_page=product_info&cPath=34&products_id=89&zenid=o5rdlc63vhnd59440v8m23jgg4The loose slide to frame fit designed into all Glock pistols inhibits accuracy when using a frame mounted optic.
http://www.brianenos.com/forums/index.php?showtopic=149253Frame-to-slide fit on an iron-sighted gun is not that critical. The "repeatable lockup" that we desire is achieved inside the slide, which is attached to the sights. Good.
On a gun with a frame-mounted optical sight, this fit is critical. The sights are attached to the frame, so repeatability is needed in every junction.
Striker-fired guns, such as the Glock, M&P, and XD series, are a different matter altogether. Although accuracy won't suffer, the quality of the trigger pull is dependent on this fit.
I know nothing about gunsmithing, but the above quotes are the type of thing you hear all the time about glocks.
Sig feels it necessary to address it in their marketing...
http://www.sigsauer.com/CatalogProductDetails/1911-spartan.aspxThe SIG SAUER® 1911 proves that close tolerances equal complete reliability and need not be incompatible in an off-the-shelf pistol.