I told the guy i was looking for an assault rifle chambered in 5.56x45 and asked the guy if the gun was chambered in .223 or 5.56, he replied in a rude condescending voice "listen kid, the 5.56 and the .223 round and upper receivers are 100% the exact same thing, the only difference is in the name." Shocked at how rude he was but still trying to be polite i told him that the bullets measurements were the same but there are a 2 key differences between the 5.56 and .223.
Professional guy
I shopped online and stopped at Osbornes just to compare. They had better gun prices and fast service.
This shop is run by a guy thats quite up there in years and seems to be set in his ways. I would highly recommend taking everything this guy says with a grain of salt. I would hate to see anyone getting hurt because of misinformation. I was in there last week looking to buy a new AR-15 chambered in 5.56x45.The guy had just one rifle of that style in his shop and it was chambered in .223.
After explaining all of this to this old guy in not so many words (for what i could get in) he basically told me i was making stuff up and proceeded to kick me out of his store.
Great little gun store. Has little of everything. Old history stuff too.
First i told the guy that shooting .223 through a 5.56 chamber results in lower pressure, but still functions (safely). Firing 5.56 through a .223 chamber, however, results in somewhat higher pressures. Although the differences aren't massive (5%), extensive firing of 5.56 through a .223 chamber could lead to over-pressure malfunctions, such as popped primers or blown cartridge case heads and other firearm malfunctions.
Second and the most important difference between .223 and 5.56 is in the length of the throat of the chamber. The leade for 5.56 chambers is nearly twice as long as that of a .223 chamber (.162in to .085in, respectively). If a 5.56 round contacts the barrel rifling too early, it can cause pressure spikes (leading to malfunction, and potentially damage) in the chamber. This explains why it is safe to fire .223 through a 5.56 chamber, but not recommended to fire 5.56 through a .223 chamber.
Osborne S Gunsmithing is a US Store based in White Cloud, Michigan. Osborne S Gunsmithing is located at 814 E Jackson St, White Cloud, MI 49349, USA.
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