▁ ▁Fire ar ms ▁Author , ▁Frank ▁James , ▁writes ▁that ▁the ▁decre ased ▁velocity ▁from ▁the ▁shorter ▁bar rel ▁causes ▁performance ▁of ▁the ▁round ▁to ▁be ▁less ▁than ▁optimal ▁when ▁used ▁in ▁a ▁def ensive ▁situation . ▁ ▁R eli ability ▁and ▁accuracy ▁can ▁be ▁improved ▁through ▁modifications ▁such ▁as ▁replacing ▁the ▁stock ▁bar rel ▁b ushing ▁with ▁an ▁after market ▁part ▁and ▁jud ici ously ▁hon ing ▁the ▁ham mer ▁and ▁se ar . ▁Bey ond ▁trigger ▁work , ▁more ▁s oph istic ated ▁modifications ▁include ▁replacing ▁the ▁stock ▁ham mer ▁and ▁se ar ▁with ▁light weight ▁components , ▁installing ▁a ▁high ▁quality ▁spring ▁set ▁and ▁be vel ing ▁the ▁inside ▁of ▁the ▁e jection ▁port . ▁ ▁References ▁ ▁Category : . 4 5 ▁A CP ▁semi - autom atic ▁p ist ols ▁Category : 1 9 1 1 ▁platform ▁Category : Col t ▁semi - autom atic ▁p ist ols ▁Category : Short ▁re co il ▁fire ar ms <0x0A> </s> ▁Ir win ▁J . ▁Rosen house ▁( 1 9 2 4 - 2 0 0 2 ) ▁was ▁an ▁American ▁visual ▁artist ▁based ▁in ▁New ▁York ▁City . ▁ ▁Early ▁life ▁and ▁education ▁Rosen house ▁was ▁born ▁in ▁Chicago ▁in ▁ 1 9 2 4 . ▁He ▁served ▁in ▁the ▁US ▁Mer chant ▁Marine ▁and ▁later ▁earned ▁his ▁B FA ▁from ▁Cooper ▁Union . ▁ ▁Career ▁Rosen house ' s ▁early ▁career ▁included ▁work ▁as ▁a ▁designer ▁at ▁the ▁Museum ▁of ▁Modern ▁Art ▁and ▁created ▁illustr ations ▁for